( CNN ) -- The mosque on Prospect Street is not only Cambridge , Massachusetts , ' largest mosque , but it is also the city 's only mosque . As many as 1,000 people a week , including immigrants , students , families and residents from surrounding neighborhoods , stop by to pray up to five times a day as Islam requires . Known as the Cambridge mosque , it is run by the Islamic Society of Boston and is just a few short blocks from the well-traveled Red Line , which serves Boston 's many universities and colleges . `` The mosque is open to everyone , '' says spokeswoman Nicole Mossalam . `` We do n't have a core membership . It 's very fluid . '' Law enforcement officials say the mosque has attracted a number of known terrorists and accused extremists , among them the accused Boston Marathon bombers , `` Lady al Qaeda , '' and now an American fugitive wanted for questioning for possible ties to ISIS ' social-media wing -- too many for law enforcement to ignore . `` At some stage we have to accept reality , which is a number of people who have taken up arms against Americans either here in Boston or abroad with ISIS have an affiliation with that mosque , and so the mosque will come under scrutiny to determine what is going on and whether as importantly , there are n't others affiliated with the mosque who might be planning ill will , '' said Juliette Kayyem , CNN national security analyst and former Department of Homeland Security assistant secretary . At least 10 suspected or convicted terrorists have prayed at the mosque , a number confirmed by a federal law enforcement official , court documents and the mosque itself . `` None of these individuals , if and when they prayed at the ISB mosque , ever exhibited any hint of criminal or violent behavior . ... The Islamic Society of Boston unequivocally condemns ISIS and is deeply angered by the grievous harm it has done to innocent lives : American , Iraqi , Syrian and more , '' Mossalam said . She said , for the most part , the individuals did not participate in the mosque community or its programs . Nor is there any evidence suggesting Cambridge mosque officials knew or were involved with the suspects , nor do they preach any form of radical Islam . Still , the list of controversial worshipers is striking for their apparent ties to ISIS , al Qaeda and other extremist groups targeting the United States and its interests . Among the most prominent Cambridge mosque attendees : . Dr. Aafia Siddiqui , an MIT-educated , Pakistani neuroscientist serving 86 years in federal prison , has been dubbed `` Lady al Qaeda '' and become the poster girl for Islamic Jihad . ISIS militants who beheaded American journalist James Foley sent a letter to the family saying it had offered a prisoner exchange naming `` sister Dr. Afia Sidiqqi ( sic ) . '' CNN recently interviewed Fowzia Siddiqui in Pakistan , who said her sister 's name had been appropriated by terrorists : `` We want no violence in Aafia 's name , '' she said . In 2008 , Siddiqui was arrested in Afghanistan with numerous bomb-making documents , specifically for chemical and biological weapons , for a `` mass casualty attack '' against potential targets like the Statue of Liberty and Brooklyn Bridge . Her second husband is a nephew of 9/11 mastermind Khalid Sheik Mohammed . Siddiqui was not tried for terrorism but for grabbing a gun and opening fire on FBI agents during interrogation . Accused terror fugitive Ahmad Abousamra also attending services at the Cambridge mosque . He is being looked at in connection with ISIS ' propagandist social media . Raised outside Boston , he speaks fluent English and Arabic and graduated from the University of Massachusetts , Boston , with a degree in computer science . He vanished from America in 2006 after allegedly receiving terror training in Yemen and fighting against U.S. troops in Iraq . His friend and fellow Cambridge mosque worshiper , pharmaceutical student Tarek Mehanna , is serving 17 years in federal prison after being found guilty of translating material for al Qaeda in Iraq , the precursor to ISIS . He appealed his case to the Supreme Court . `` All Muslims are obligated to pray five times a day and the Cambridge mosque is open for worship for all people ; no ID 's are checked ; no one is excluded . If we ever observed any criminal or violent behavior , we would immediately intervene and notify the authorities , '' Mossalam said . Boston Marathon bomber Tamerlan Tsarnaev was kicked out of the Cambridge mosque , according to a mosque member who spoke to CNN at the time of the attack . During prayers , Tamerlan Tsarnaev had several outbursts denouncing Muslims ' incorporation of American holidays . The mosque confirms that Tamerlan Tsarnaev attended , as did his brother Dzhokar and Tsarnaev friend Ibragim Todashev . Todashev was allegedly involved with Tamerlan Tsarnaev in a triple murder in Waltham , Massachusetts . He was about to sign a sworn confession when he allegedly grabbed a knife and lunged at an FBI agent , who then fatally shot Todashev . The FBI investigated and called the shooting justified . In June , federal prosecutors charged another Cambridge mosque attendant with obstruction of justice in connection with the suspected marathon bombers . Part-time taxi driver Khairullozhon Matanov invited the Tsarnaev brothers to dinner the night of the marathon attack . Authorites say he deleted documents and photos from his computer after being notified he might be questioned by federal authorities in connection with the attack . `` You have data point after data point about various men , young men , coming to the mosque and becoming radicalized and then planning harmful events , then the mosque is and ought to be subject of scrutiny because there 's just too many factors involved now , '' said retired DHS official Kayyem . The mosque was founded in 1981 . Other controversial Cambridge worshipers include one of the mosque founders , Abdulrahman Alamoudi , who is serving 23 years after pleading guilty in 2004 to activities with `` nations and organizations that have ties to terrorsim . '' The Mosque spokeswoman said the charges were filed after Alamoudi distanced himself from the mosque . The FBI described Alamoudi 's prosecution as a `` major terrorism case . '' Mossalam stressed the Islamic Society of Boston 's record of `` building bridges of faith , fellowship and understanding '' with other religions and working with `` local , state and federal public officials . ''
Officials : Accused Boston Marathon bombers , other extremists attended mosque . At least 10 suspected or convicted terrorists have prayed at the mosque , officials say . Score: 6