DETROIT -- DETROIT (AP) — A convicted felon who was wearing body armor when police arrested him in a Detroit suburb will be questioned in an investigation into the fatal shooting of three men in a back gambling room of an east side barbershop.

Detroit Police Chief James Craig described the man as a person of interest in Wednesday evening's shooting at Al's Barber Shop that left six other people wounded. Speaking at a Thursday news conference at police headquarters, Craig said the bloodshed may have stemmed from an ongoing feud.

Craig did not name the person of interest and provided few details about the arrest. He said Rochester police picked up the man north of Detroit without incident on an unrelated felonious assault charge.

"Police wear body armor. Why would a community member be driving around in body armor?" said Craig, who described the latest mass shooting in Detroit as "urban terrorism."

Craig said 20 to 30 people were gambling in a tiny back room at the barbershop in a strip mall shortly before 6 p.m. when shots were fired from a high-powered rifle through an open back door.

When the gunfire began, the gamblers tried to escape the room through a door that led back into the barbershop, but that the jam of bodies prevented them from escaping.

"The shooter struck nine of the individuals inside the location," Craig said, adding that many people in the room were armed and at least one returned fire.

"Officers were able to develop information that there was an ongoing feud between a particular individual and several members of the gambling party," the chief said.

Craig declined to say whether police think the person of interest is the shooter. But he would say that the shooter is suspected in at least two other violent crimes.

Two of Wednesday's shooting victims died inside the gambling room. The third died later at a hospital. The conditions of the survivors were not available.

A witness told police that the shooter pulled into a rear alley and fired shots at someone in a pickup truck. He then got out of the car and began shooting into the open rear door of the barbershop.

Wednesday night police said they were seeking two vehicles believed to have been involved in the shooting.

Lorne Carter told the Detroit Free Press that he was smoking a cigarette against the wall of a nearby business when he heard what sounded like 30 to 40 rapid shots.

Detroit has one of the highest violent crime rates in the country. Including Wednesday night's barbershop slayings, 289 criminal homicides have been committed so far this year in Detroit.

Criminal homicides accounted for 386 of the 461 death investigations in 2012.

"Anytime you have ... shootings of nine, it certainly does rise up as one of Detroit's more violent incidents," Craig said.

Craig said one person was shot and three others wounded during a shooting in October 2012 on the city's west side. Seven teenagers — including five students at Cody Ninth Grade Academy — were shot and wounded while waiting at a bus stop near that school in June 2009.

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Associated Press writers David N. Goodman and David Runk contributed to this report.

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    Defense contract employee and former Navy reservist Aaron Alexis, 34, allegedly opened fire shortly after 8 a.m. inside building 197 in the Washington Navy Yard, <a href="http://www.huffingtonpost.com/2013/09/17/washington-navy-yard-shooting-victims_n_3940206.html" target="_hplink">killing 12 people and wounding more than a dozen others</a>. Alexis was slain in a gun battle with police.

  • Sept. 11, 2013 - Crab Orchard, Tenn. - 4 dead

    Jacob Allen Bennett, 26, was arrested <a href="http://www.huffingtonpost.com/2013/09/13/4-bodies-identified_n_3921044.html" target="_hplink">in the shooting deaths of a woman and three teenagers</a>. Their bodies were found in a car about 50 miles west of Knoxville, Tenn.

  • August 14, 2013 - Oklahoma City, Okla. - 4 dead

    Daniel Livingston Green, 40, <a href="http://newsok.com/oklahoma-city-man-charged-with-killing-four-family-members/article/3874045" target="_hplink">was arrested on four counts of first-degree murder</a>, after his mother, sister and her two children were discovered fatally shot inside their home.

  • August 11, 2013 - Omaha, Neb. - 4 dead

    Nikko Jenkins, 26, <a href="http://www.businessinsider.com/nikko-jenkins-alleged-murders-in-omaha-2013-9" target="_hplink">was arrested for allegedly shooting four people in the head</a>. Police say three of the four victims had no connection to Jenkins.

  • Aug. 7, 2013 - Dallas - 4 dead

    Erbie Lee Bowser, 44, a former teacher and Dallas Mavericks hip-hop dancer, was charged with two counts of capital murder after police said he <a href="http://www.huffingtonpost.com/2013/08/08/dallas-shooting-spree_n_3723955.html" target="_hplink">attacked the homes of his estranged wife and his girlfriend</a>, killing both women and two of their children. Four additional people were wounded in the attacks.

  • July 26, 2013 - Hialeah, Fla. - 7 dead

    Police say Pedro Vargas, 42, went on a shooting spree in his South Florida apartment complex, <a href="http://www.huffingtonpost.com/2013/07/31/hialeah-shooting_n_3683750.html" target="_hplink">killing the building's two managers, a family of three, and a man returning from his son's boxing practice</a>. Before the attack, Vargas called the police asking the dispatcher to run the license plate of a vehicle parked outside the building, after reporting he had been followed and threatened by people doing witchcraft. Vargas was killed by a SWAT team after an eight-hour stand-off with police, during which he took two people hostage. The hostages were rescued when the SWAT team stormed the apartment.

  • July 26, 2013 - Clarksburg, W. Va. - 4 dead

    Sidney Muller, 27, was arrested on four counts of first-degree murder for allegedly <a href="http://www.huffingtonpost.com/2013/07/26/sidney-muller_n_3661185.html" target="_hplink">killing two individuals after a drug deal gone wrong</a>. Muller allegedly then turned his weapon on two passersby, a father and his son who were delivering the local newspaper, killing them.

  • June 7, 2013 - Santa Monica, Calif. - 5 dead (including gunman)

    Police say John Zawahri, 23, armed with a homemade assault rifle and high-capacity magazines, <a href="http://www.huffingtonpost.com/2013/06/09/john-zawahri-santa-monica_n_3409649.html" target="_hplink">killed his brother and father at their home</a> and then headed to Santa Monica College, where he carjacked a woman, ordering her to drive him around while he fired at other people. The woman escaped unharmed but <a href="http://www.huffingtonpost.com/2013/06/09/john-zawahri-santa-monica_n_3409649.html" target="_hplink">two other people were gunned down</a>. Zawahri was confronted by police outside the school's library. They traded fire and police officers ultimately shot him dead.

  • May 11, 2013 - Waynesville, Ind. - 4 dead

    <a href="http://www.huffingtonpost.com/2013/05/14/waynesville-murder-investigation_n_3272762.html" target="_hplink">Four bodies were discovered in a home after a vicious killing</a> that authorities said was a drug-related crime. One victim's son returned home to find the bodies and reported them to 911. Police say Samuel Sallee, 55, is <a href="http://www.nydailynews.com/news/crime/indiana-cops-hold-suspect-drug-related-quadruple-murder-article-1.1375677" target="_hplink">the prime suspect</a> in the case.

  • May 10, 2013 - Fernley, Nev. - 5 dead

    Jeremiah Bean, 25, was arrested days after allegedly <a href="http://www.huffingtonpost.com/2013/05/18/jeremiah-bean-charged_n_3298786.html" target="_hplink">killing an elderly couple in their home, then a newspaper delivery man and another couple nearby</a>. Police say the first attack went undetected, giving Bean the opportunity to commit the three others. He was arraigned on 19 counts, including first-degree murder, arson and burglary.

  • April 24, 2013 - Manchester, Ill. - 5 dead

    Rick Odell Smith, 43, allegedly stormed a <a href="http://www.huffingtonpost.com/2013/04/25/illinois-family-shot_n_3157658.html" target="_hplink">home, killing five members of the same family</a>. Smith had been in a dispute with at least one of the victims, potentially over the custody of a child, police said. The five victims included <a href="http://www.huffingtonpost.com/2013/04/24/manchester-illinois-shoot-5-dead_n_3146686.html" target="_hplink">a grandmother, her granddaughter, the granddaughter's boyfriend and their two children</a>

  • April 21, 2013 - Federal Way, Wash. - 4 dead

    <a href="http://www.huffingtonpost.com/2013/04/22/washington-shooting_n_3130086.html" target="_hplink">A domestic-violence homicide claimed three additional lives</a> before the gunman was killed by responding officers. Police say Dennis Clark III, 27, shot and killed his girlfriend in their shared apartment before killing two witnesses in the building's parking lot and a third victim in another apartment

  • April 18, 2013 - Akron, Ohio - 4 dead

    Derrick Brantley and Deshanon Haywood, both 21, were each charged for the <a href="http://www.newsnet5.com/dpp/news/local_news/akron_canton_news/1-million-bonds-for-men-charged-with-murder-in-akron-quadruple-homicide" target="_hplink">murder of four adults</a>, two men and two women, who had been found shot in the head in a townhouse basement. Police say two guns were used.

  • March 13, 2013 - Herkimer County, N.Y. - 4 dead

    In a shooting rampage that spanned two upstate New York villages, Kurt Meyers, 64, allegedly <a href="http://www.huffingtonpost.com/2013/03/18/kurt-myers-shootout-suspect-penniless_n_2903413.html" target="_hplink">took the lives of four people.</a> Police say Meyers first opened fire in a barber shop in Mohawk, killing two customers, one a retired corrections officer. The gunman then fled to an auto care business in neighboring Herkimer and fatally shot an employee and a customer who was a 23-year veteran of the state Department of Corrections. According to authorities, the gunman had no money, no job and was maxed out on his credit cards.

  • Jan. 19, 2013 - Albuquerque, N.M. - 5 dead

    Nehemiah Griego, 15, is accused of <a href="http://www.huffingtonpost.com/2013/01/21/nehemiah-griego-teen-shoots-parents-3-children_n_2519359.html" target="_hplink">killing both his parents and three younger siblings</a>. According to police documents, Griego shot his mother while she slept, then killed his brother and sisters after they woke up. Griego told authorities he ambushed his father, who was returning home from work, with a semi-automatic rifle that his parents owned. All victims appeared to have gunshot wounds to the head. New Mexico authorities also report that the teen had planned to go to Walmart and randomly shoot people.

  • Jan. 7, 2013 - Tulsa, Okla. - 4 dead

    Brothers Cedric Poore, 39, and James Poore (pictured), 32, are accused of <a href="http://www.huffingtonpost.com/2013/02/06/cedric-poore-james-poore-_n_2633512.html" target="_hplink">killing four women</a>, two of whom were twins. The victims, found in an apartment, were all mothers, and a 3-year-old boy was also found unharmed.