A mosque in Cambridge, Mass., confirmed Saturday that Dzhokhar Tsarnaev and Tamerlan Tsarnaev, the Chechen-born brothers suspected in the Boston marathon attacks, infrequently attended services at the small center that was a 10-minute walk from their apartment.

"In their visits, they never exhibited any violent sentiments or behavior. Otherwise they would have been immediately reported to the FBI," said the statement from the Islamic Society of Boston. "After we learned of their identities, we encouraged anyone who knew them in our congregation to immediate report to law enforcement, which has taken place."

Anwar Kazmi, a member of the mosque's board of trustees, told a USA Today reporter that 26-year-old Tamerlan Tsarnaev, who died early Friday morning after a shootout with police, was an infrequent attendee for about a year-and-a-half, while 19-year-old Dzhokhar A. Tsarnaev, who was captured hiding in a boat in Watertown on Friday night, attended only once.

The Los Angeles Times initially reported that Tamerlan Tsarnaev was kicked out of the mosque three months ago after he interrupted a Friday prayer service to argue with the imam. The imam leading the service had enraged Tsarnaev by praising Martin Luther King Jr. A congregant told the newspaper that Tsarnaev shouted, "You cannot mention this guy because he’s not a Muslim!” When Tamerlan Tsarnaev later returned to prayer services at the mosque, there were no additional incidents.

In an update on Sunday, the Los Angeles Times quoted Kazmi, who said that Tsarnaev was not kicked out after the outburst but that mosque staff spoke to him and he calmed down. "That was the only untoward sort of incident," Kazmi told a reporter.

The Cambridge mosque did not return a phone call and email from The Huffington Post asking for more details on the confrontation.

Imam Suhaib Webb, of the Islamic Society of Boston Cultural Center, the city's largest mosque, said in an interview that he had recently heard of the incident. "That's a sign right there that his views aren't mainstream," Webb said.

The Cambridge mosque leaders' theology is not extremist, he said. Webb's mosque has the same owners but a separate administration from the Islamic Society of Boston. Webb said he never met the brothers and had not found their names on his mosque's membership list.

Reports previously quoted friends of the brothers saying they had attended the mosque, but Saturday was the first time the mosque confirmed their association.

"Right now, our focus will remain on grieving for the victims and their families, praying for a speedy recovery for the injured, and offering what support we can to all in need," the statement said.

Friends and family have described Tamerlan Tsarnaev as becoming more strident in his religious views in recent years. Federal authorities are investigating a six-month trip he took in 2012 to Chechnya and Dagestan, Muslim-majority regions in Russia and home to militant separatist movements. Reports have painted Dzhokhar A. Tsarnaev as also being interested in Chechen independence movements.

The investigation is ongoing into the motivation for the bombings.

On Monday afternoon, the Islamic Society of Boston released a statement with more information about the Tsarnaev brothers' relationship to the Cambridge mosque. The statement largely confirms earlier reports but offers more details. "As the details related below will show ... one suspect disagreed with the moderate American-Islamic theology of the ISB Cambidge mosque," it says. Part of it is reprinted below.

Below is the detailed account of the suspects’ connection to our mosque related to us from our congregants to date:

-- Neither the ISB Board nor staff ever interacted with the suspects. When congregants have shared their knowledge of the suspects, the ISB leadership immediately instructed them to call the FBI.

-- The suspects were neither members nor regular attendees of our Cambridge mosque. The older suspect began coming intermittently to our congregational prayers on Friday over a year ago and occasionally to our daily prayers. The younger suspect was rarely seen at the center, coming only occasionally for prayer.

-- On November 16, 2012 at our weekly congregational prayer, one of our preachers sermonized that it was appropriate to celebrate national holidays like July 4th and Thanksgiving, just like the birthday of the Prophet (Peace Be Upon Him). The older suspect stood up during the sermon and challenged the preacher, arguing that celebration of any
holiday was not allowed in the faith. After the sermon ended and the congregational prayer was finished, the preacher met with the older suspect to share his opinion. The suspect repeatedly argued his viewpoint, and then left.

-- On January 18, 2013, one of our preachers noted that Dr. Martin Luther King, Jr. was a great person remembered in history. The older suspect stood up, shouted and called him a “non-believer”; said that he was “contaminating people’s mind”; and began calling him a hypocrite. People of the congregation, in turn, shouted back at the older suspect, “Leave now!” Due to the congregation’s disapproval, he left the sermon.

-- After the sermon and the congregational prayer ended, a few volunteer leaders of the mosque sat down with the older suspect and gave him a clear choice: either he stops interrupting sermons and remains silent or he would not be welcomed. While he continued to attend some of the congregational prayers after the January incident, he neither interrupted another sermon nor did he cause any other disturbances.

The ISB leadership must note that this is the account we have to date.

This story has been updated with comment from the Islamic Society of Boston and from Anwar Kazmi about the outburst by Tamerlan Tsarnaev at the Cambridge mosque.

CORRECTION: An earlier version of this story misidentified the Cambridge mosque briefly attended by Tamerlan Tsarnaev as the Islamic Center of Boston. It was the Islamic Society of Boston.

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  • Azamat Tazhayakov, Dias Kadyrbayev, Dzhokhar Tsarnaev

    This undated photo added on April 18, 2013 to the VK page of Dias Kadyrbayev shows, from left, Azamat Tazhayakov and Dias Kadyrbayev, from Kazakhstan, with Boston Marathon bombing suspect Dzhokhar Tsarnaev in Times Square in New York. Kadyrbayev and Tazhayakov, two college buddies of Tsarnaev, were jailed by immigration authorities the day after Tsarnaev's capture. They are not suspects, but are being held for violating their student visas by not regularly attending classes, Kadyrbayev’s lawyer, Robert Stahl said. They are being detained at a county jail in Boston. (AP Photo/VK)

  • Dias Kadyrbayev, Dzhokhar Tsarnaev

    This undated photo found on the VK page of Dias Kadyrbayev shows Kadyrbayev, left, with Boston Marathon bombing suspect Dzhokhar Tsarnaev, at an unknown location. Kadyrbayev and Azamat Tazhayakov, two college buddies of Tsarnaev from Kazakhstan, were jailed by immigration authorities the day after his Tsarnaev's capture. They are not suspects, but are being held for violating their student visas by not regularly attending classes, Kadyrbayev’s lawyer, Robert Stahl said. They are being detained at a county jail in Boston. (AP Photo/VK)

  • FILE - This combination of undated file photos shows Tamerlan Tsarnaev, 26, left, and Dzhokhar Tsarnaev, 19. The CIA added the name of dead Boston Marathon bombing suspect Tamerlan Tsarnaev, to a U.S. government terrorist database 18 months before the deadly explosions, U.S. officials told The Associated Press on Wednesday, April 24, 2013. The CIA's request came about six months after the FBI investigated Tamerlan Tsarnaev, also at the Russian government's request, but the FBI found no ties to terrorism, officials said. (AP Photo/The Lowell Sun & Robin Young, File)

  • Dzhokhar Tsarnaev

    FILE - This wanted poster released by the FBI on Friday, April 19, 2013 shows Dzhokhar Tsarnaev, the suspect the FBI orginally called suspect number 2 in the bombings at the Boston Marathon. (AP Photo/FBI)

  • Katherine Tsarnaeva, Judith Russell

    Katherine Tsarnaeva , widow of Boston Marathon bomber suspect Tamerlan Tsarnaev, leaves the law office of DeLuca and Weizenbaum, with her mother Judith Russell, Tuesday, April 23, 2013, Providence, R.I. The attorneys, Amato DeLuca and Miriam Weizenbaum, issued a statement saying Tsnarnaeva is deeply mourning the bombing victims. They say that Tsarnaeva and her family were in shock when they learned of allegations against her husband and brother-in-law, Dzhokhar Tsarnaev. (AP Photo/Stew Milne)

  • Zubeidat Tsarnaeva

    Zubeidat Tsarnaeva, mother of Tamerlan and Dzhokhar Tsarnaev, the two men accused of setting off bombs near the Boston Marathon finish line on April 15, 2013 in Boston, walks near her home in Makhachkala, Dagestan, southern Russia, Tuesday, April 23, 2013. The Tsarnaev brothers are accused of setting off the two bombs at the Boston Marathon on April 15 that killed three people and wounded more than 260. Tamerlan Tsarnaev, 26, was killed in a gun battle with police. His 19-year-old brother, Dzhokhar Tsarnaev, was later captured alive, but badly wounded. (AP Photo/Ilkham Katsuyev)

  • This Monday, April 15, 2013 photo provided by Bob Leonard shows bombing suspects Tamerlan Tsarnaev, 26, center right in black hat, and his brother, Dzhokhar A. Tsarnaev, 19, center left in white hat, approximately 10-20 minutes before the blasts that struck the Boston Marathon. It's a vexing puzzle about the Boston Marathon bombings: The younger of the two accused brothers hardly seemed headed for a monumental act of violence. How could he team up with his older brother to do this? Nobody knows for sure, but some experts in sibling research say the powerful bonds that can develop between brothers may have played a role. (AP Photo/Bob Leonard)

  • This image taken from surveillance video provided by the Boston Regional Intelligence Center shows Boston Marathon bombing suspect Dzhokhar Tsarnaev at a Bank of America ATM in Watertown, Mass. at 11:18 p.m. on April 18, 2013. The next day, police intercepted Dzhokhar and his 26-year-old brother Tamerlan in a blazing gunbattle that the elder brother dead. Dzhokhar, 19, is charged with carrying out the Boston Marathon bombing April 15 that killed three people and wounded more than 260, and he could get the death penalty. (AP Photo/Boston Regional Intelligence Center)

  • This image taken from surveillance video provided by the Boston Regional Intelligence Center shows Boston Marathon bombing suspect Dzhokhar Tsarnaev at a Bank of America ATM in Watertown, Mass. at 11:18 p.m. on April 18, 2013. The next day, police intercepted Dzhokhar and his 26-year-old brother Tamerlan in a blazing gunbattle that the elder brother dead. Dzhokhar, 19, is charged with carrying out the Boston Marathon bombing April 15 that killed three people and wounded more than 260, and he could get the death penalty. (AP Photo/Boston Regional Intelligence Center)

  • Boston Marathon Explosions

    This photo released Friday, April 19, 2013 by the Federal Bureau of Investigation shows a suspect that officials identified as Dzhokhar Tsarnaev, being sought by police in the Boston Marathon bombings Monday. (AP Photo/Federal Bureau of Investigation)

  • This combination of photos provided on Friday, April 19, 2013 by the Federal Bureau of Investigation, left, and the Boston Regional Intelligence Center, right, shows a suspect that officials have identified as Dzhokhar Tsarnaev, being sought by police in connection with Monday's Boston Marathon bombings. (AP Photo/FBI, BRIC)

  • CNN confirms this was a former Twitter profile picture of the suspected Boston Marathon bomber.

  • Dzhokhar's profile photo on the social networking site vk.com was uploaded on March 19 2012. h/t <a href="http://www.buzzfeed.com/chrisgeidner/what-we-know-about-boston-marathon-bomb-suspect-dzhokhar-tsa" target="_blank">Buzzfeed</a>

  • Boston Police Department <a href="https://twitter.com/Boston_Police/status/325224387731152897" target="_blank">tweeted out this photo</a> of Dzhokhar Tsarnaev on Friday morning.

  • Robin Young (<a href="https://twitter.com/hereandnowrobin" target="_blank">@hereandnowrobin</a>) tweeted a photo of her nephew and Dzhokhar at graduation. She wrote: "My beloved nephew on right, djohar tsarnaev on left, happy cambridge Rindge and Latin grads.heartbreaking."

  • This photo, found on the social networking site vk.com shows Dzhokhar with an unidentified friend. The photo was uploaded 8 April, 2012.

  • Dzhokhar Tsarnaev (shown here, in black, with his face toward the camera) faced Milford High School's Andy Gleeson during a wrestling match in December 2010 in Framingham, Mass.