ANAHEIM, Calif. — The densely packed neighborhood where police shot to death an unarmed man this weekend and angry residents faced off with authorities in fiery clashes is just a few miles up the road from Disneyland but a world away from the theme park's shine and shimmer.

With another officer-involved killing Sunday, involving a man who allegedly shot at police, residents of this city of 336,000 people are questioning what has made officers resort to deadly force and crack down on demonstrators by firing pepper ball and bean bag rounds.

The killings take the tally of officer-involved shootings to six so far this year, up from four a year before, said Anaheim police Sgt. Bob Dunn. Five of the incidents this year have been fatal.

"It concerns me when we have any officer-involved shooting," said Police Chief John Welter, adding that he believes an uptick in gang-related crime in the last eight to 10 months is driving the increase.

"There just seems to be a lot more violence between the gangs. As a result, we've increased our gang unit, which has increased our contact with gang members," he said.

Anaheim is a city of contrasts that ranges from upscale, hilltop homes to packed, gritty apartment complexes. The city 25 miles southeast of Los Angeles is known as home to the Angels baseball team, and above all, to world-famous Disneyland.

Mayor Tom Tait issued a statement Monday calling on the state attorney general's office and the U.S. attorney's office to aid a full, independent investigation.

In the largely Hispanic, working-class neighborhood where 25-year-old Manuel Diaz was killed Saturday afternoon, residents left candles, flowers and posters blasting police and questioned why officers would shoot a man they said was a gang member but didn't have a gun or appear to be committing a crime.

Jose Gallardo, 30, said he was chatting with Manuel Diaz in an alley behind the complex Saturday afternoon just a few minutes before he saw an unmarked police car pull up carrying two officers. Gallardo said he stayed away to avoid drawing attention from police until he heard two shots and went running.

"He was laying there, dead," Gallardo said, adding that he saw bullet marks in his friend's lower back and neck. "They were searching him – I was like, why are you searching him? He's dead right there."

The death sparked two nights of protests. On Saturday, angry demonstrators hurled rocks and bottles at officers who were securing the scene for investigators, and police responded by firing bean bags and pepper balls at the crowd.

The next morning, protesters stormed a news conference at police headquarters. Later that night, demonstrators set fire to a trash bin and pushed it into the street outside the apartment complex, which was still strewn with litter early Monday from the unrest.

Welter said the shooting occurred after two officers approached three men who were acting suspiciously in an alleyway before running away. One of the officers chased Diaz to the front of the apartment complex.

The chief would not say what exactly led the officer to shoot Diaz, who authorities say was a known gang member. But Diaz wasn't just hanging out in the alley. He failed to heed police orders to stop and threw something on the roof of the complex that contained what officers believe to be heroin, Welter said.

"He certainly was running from police and not stopping," Welter said. "That's no justification for shooting him, so I will be interested in what the district attorney finds out."

Both officers were placed on paid leave pending an investigation.

The second officer-involved shooting occurred Sunday when anti-gang officers spotted a suspected gang member in a stolen sport utility vehicle. A brief pursuit ended when three people jumped from the SUV and ran, authorities said.

During the chase, a suspect fired one or two rounds at an officer. The officer returned fire, killing the gunman, who was identified as 21-year-old Joel Mathew Acevedo, Dunn said.

Both incidents were under investigation by the county's district attorney office, which asked witnesses to come forward with information or video footage of Saturday's shooting.

Online court records show Diaz was convicted last year of drug possession, and three years earlier of possessing a firearm on school grounds and being a member of a criminal street gang.

On Monday, residents remembered him as a young man who was friendly to people in the neighborhood and stopped to read posters affixed to a fence near the spot where Diaz was shot. The signs read, "another person dead" and "stop killing, start protecting."

Junior Lagunas, 19, had his forearm wrapped in white bandages and a hospital identification bracelet around his wrist as he recovered from being bitten by a police dog during the Saturday night melee.

Lagunas said he went outside with his girlfriend and 1-year-old son to observe the commotion when police began firing something, possibly bean bags, at the crowd.

He said he ducked and pushed the child, still in his stroller, to the ground, then turned around and saw a dog gnaw on his arm, leaving teeth marks and drawing blood.

"It's just crazy, the cops are going crazy on us," said Lagunas, who was friendly with Diaz.

Video captured by a KCAL-TV crew showed a chaotic scene as some people ducked to the ground and others scattered screaming. A man is seen yelling at an officer even as a weapon is pointed at him. Two adults huddled to shield a boy and girl.

Police said five people, two of them juveniles, were arrested that night. Authorities said the dog accidentally escaped from a patrol car, and the incident is being investigated by the department.

Police also are reviewing the use of bean bags and pepper spray during the protests, which grew raucous when officers moved to arrest someone in the crowd suspected of committing a minor crime, Welter said. The man was later found to be wanted in a murder case.

Carroll Seron, a professor of criminology at University of California, Irvine, said relations between police and minority communities are often tense and an incident such as a shooting can trigger a loud reaction.

"In lots of instances, people kind of reach a threshold where they feel their communities are a little bit under siege," she said.

The shootings in Anaheim came a year after an unarmed, mentally ill homeless man died after a violent confrontation with police in the nearby city of Fullerton. The death of Kelly Thomas sparked protests by outraged residents, criminal charges against two officers, an FBI investigation and the recall of three elected councilmembers.

Outside the Anaheim apartment complex, Caleb Fuentes, 23, left flowers for Diaz, a man he said was like a big brother when the two played junior varsity basketball at Anaheim High School.

Fuentes said he hadn't seen Diaz since those days but wondered if he, too, could end up like his old friend.

"If I wore baggy clothes and had a shaved head, would they shoot me, too?" he said.

___

Associated Press videojournalist Raquel Maria Dillon contributed to this report.

Earlier on HuffPost:

Loading Slideshow...
  • Protests Continue In Anaheim Against The Police Department's Recent Shootings

    ANAHEIM, CA - JULY 29: A line of Orange County Police Officers block a freeway overpass leading to Disneyland during a protests to show outrage for the several recent officer involved shootings on July 29, 2012 in Anaheim, California. For the past week, protesters have clashed with police resulting in both property damage and many arrests. (Photo by Jonathan Gibby/Getty Images)

  • Protests Continue In Anaheim Against The Police Department's Recent Shootings

    ANAHEIM, CA - JULY 29: A line of Orange County Police Officers block a freeway overpass leading to Disneyland during a protest to show outrage for the several recent officer involved shootings on July 29, 2012 in Anaheim, California. For the past week, protesters have clashed with police resulting in both property damage and many arrests. (Photo by Jonathan Gibby/Getty Images)ges)

  • Police confront protestors at Harbor Boulevard and Ball Road in Anaheim, Calif. on Sunday, July 29, 2012. More than 300 demonstrators rallied Sunday to denounce two fatal police shootings and to issue a call for community peace. (AP Photo/The Orange County Register, Stuart Palley) MAGS OUT; LOS ANGELES TIMES OUT

  • Protests Continue In Anaheim Against The Police Department's Recent Shootings

    ANAHEIM, CA - JULY 29: An Orange County Police vehicle rushes ahead of protesters to block a freeway overpass leading to Disneyland during a protest to show outrage for the several recent office involved shooting at the on July 29, 2012 in Anaheim, California. For the past week, protesters have clashed with police resulting in both property damage and many arrests. (Photo by Jonathan Gibby/Getty Images)

  • Anaheim Protests

    Photo from Sunday, July 29 protests. 9 people were arrested.

  • Genevieve Huizar, Correna Chavez

    Genevieve Huizar, the mother of slain man Manuel Diaz, pleads for the violence to stop.

  • Correna Chavez, Genevieve Huizar

    Genevieve Huizar, third from left, the mother of Manuel Diaz, who was shot to death by Anaheim police, breaks down after pleading for a stop to the violence and says she doesn't want that to be her son's legacy after a news conference in Santa Ana, Calif., Wednesday, July 25, 2012. Far left is her daughter, Correna Chavez. Others are unidentified. Her news conference followed a fourth day of violent protests over Saturday's police shooting of Manuel Diaz and the Sunday death of another man. (AP Photo/Damian Dovarganes)

  • Protesters hit police cars as they drive by the intersection of Broadway and Anaheim Blvd Tuesday, July 24, 2012 as police attempt to regroup to put down the disturbance. Back-to-back weekend shootings by police have sparked four days of protests. (AP Photo/The Orange County Register,Paul Rodriguez )

  • Protesters yell at police near Anaheim City hall Tuesday, July 24, 2012 in Anaheim, Calif. Riot police fired bean bag rounds and pepper balls into a crowd of protestors outside City Hall protesting a police shooting. (AP Photo/The Orange County Register, Stuart Palley)

  • Anaheim Residents Protest Police Shootings Over Weekend

    ANAHEIM, CA - JULY 24: A protester sets fire to a sign after violence erupted between police officers and protesters during demonstrations to show outrage for the fatal shooting of Manuel Angel Diaz, 25, at Anaheim City Hall on July 24, 2012 in Anaheim, California. (Photo by Jonathan Gibby/Getty Images)

  • Anaheim Residents Protest Police Shootings Over Weekend

    ANAHEIM, CA - JULY 24: A protester is taken into custody during a demonstration to show outrage for the fatal shooting of Manuel Angel Diaz, 25, at Anaheim City Hall on July 24, 2012 in Anaheim, California. (Photo by Jonathan Gibby/Getty Images)

  • Anaheim Residents Protest Police Shootings Over Weekend

    ANAHEIM, CA - JULY 24: A protester is taken into custody during a demonstration to show outrage for the fatal shooting of Manuel Angel Diaz, 25, at Anaheim City Hall on July 24, 2012 in Anaheim, California. (Photo by Jonathan Gibby/Getty Images)

  • Anaheim Residents Protest Police Shootings Over Weekend

    ANAHEIM, CA - JULY 24: Police officers take a man into custody after he refused to disburse during a demonstration to show outrage for the fatal shooting of Manuel Angel Diaz, 25, at Anaheim City Hall on July 24, 2012 in Anaheim, California. (Photo by Jonathan Gibby/Getty Images)

  • Anaheim Residents Protest Police Shootings Over Weekend

    ANAHEIM, CA - JULY 25: Police officers stand guard after protesters set fire to a near by trash bin during a demonstration to show outrage for the fatal shooting of Manuel Angel Diaz, 25, at Anaheim City Hall on July 24, 2012 in Anaheim, California. Diaz was fatally shot on July 21 by an Anaheim police officer and has sparked days of protests by the angered community. (Photo by Jonathan Gibby/Getty Images)

  • Anaheim Residents Protest Police Shootings Over Weekend

    ANAHEIM, CA - JULY 25: A police officer stands guard after protesters set fire to a near by trash bin during a demonstration to show outrage for the fatal shooting of Manuel Angel Diaz, 25, at Anaheim City Hall on July 24, 2012 in Anaheim, California. (Photo by Jonathan Gibby/Getty Images)

  • Anaheim Residents Protest Police Shootings Over Weekend

    ANAHEIM, CA - JULY 24: Police officers take a man into custody after he refused to disburse during a demonstration to show outrage for the fatal shooting of Manuel Angel Diaz, 25, at Anaheim City Hall on July 24, 2012 in Anaheim, California. (Photo by Jonathan Gibby/Getty Images)

  • Anaheim Residents Protest Police Shootings Over Weekend

    ANAHEIM, CA - JULY 24: Vons employees clean broken glass from windows that were smashed by protesters after violence erupted between police officers and protesters during demonstrations to show outrage for the fatal shooting of Manuel Angel Diaz, 25, at Anaheim City Hall on July 24, 2012 in Anaheim, California. (Photo by Jonathan Gibby/Getty Images)

  • Demonstrators gathered on the steps of Anaheim City Hall Tuesday, July 24, 2012, to protest the death of Manuel Diaz, 25, who died as a result of gunshot wounds sustained during a police pursuit by the Anaheim Police Department last Saturday on North Anna Drive. (AP Photo/The Orange County Register,Stuart Palley )

  • Police wait at the entrance to city hall in Anaheim, Calif. Tuesday July 24, 2012 as demonstrators gathered on the steps to protest the death of Manuel Diaz, 25, who died as a result of gunshot wounds sustained during a police pursuit on Saturday. (AP Photo/The Orange County Register, Stuart Palley)

  • A group of Anaheim police officers try to hold back a crowd of protesters as they wait reinforcements Tuesday, July 24, 2012, in Anaheim, Calif. (AP Photo/The Orange County Register, Paul Rodriguez)

  • A protester screams at police blocking the doorway to Anaheim City Council Chambers Tuesday, July 24, 2012 in Anaheim, Calif. (AP Photo/The Orange County Register, Paul Rodriguez)

  • Demonstrators gather on the steps of Anaheim City Hall Tuesday, July 24, 2012, to protest the death of Manuel Diaz, 25, who died as a result of gunshot wounds sustained during a police pursuit by the Anaheim Police Department last Saturday. Riot police fired bean bag rounds and pepper balls into a crowd of protestors late Tuesday outside City Hall. (AP Photo/The Orange County Register,Stuart Palley)

  • A large crowd of protesters gathered at the intersection of Broadway and Anaheim Blvd. attempt to block police cars from passing on Tuesday, July 24, 2012 in Anaheim, Calif. (AP Photo/The Orange County Register,Paul Rodriguez)

  • Police take down a protester in the intersection of Broadway and Anaheim Blvd., in Anaheim Tuesday night July 25, 2012. (AP Photo/The Orange County Register)

  • Yesenia Rojas, 35, shows off a bruise, Sunday, July 22, 2012, in Anaheim, Calif., which she says was sustained by Anaheim Police after Manuel Diaz was allegedly shot by officers on Saturday. She said officers lost control of their dogs who attacked her son and one-year-old grandson. Diaz, an allegedly unarmed man, was shot by Anaheim Police on Saturday, The Orange County Register reports. (AP Photo/The Orange County Register, Mindy Schauer)

  • A woman shouts in front of a protest sign that says "Killer Cop Beware."

  • Lupe Diaz, right, sister of Manuel Diaz, gets a hug from Theresa Smith during a protest in front of the Anaheim Police Department, Sunday, July 22, 2012, in Anaheim, Calif. Manuel Diaz, an allegedly unarmed man, was shot by Anaheim Police on Saturday, The Orange County Register reports. Smith said her son was also killed by police two years ago. (AP Photo/The Orange County Register, Mindy Schauer)

  • Protesters confront a policeman over the fatal shooting of unarmed man Manuel Diaz.