It’s now been learned that the Islamic Society of Boston, a mosque attended by the Boston Marathon bombers (Tsarnaev brothers) and founded by convicted terrorist Abdurahman Alamoudi, has also been attended by chief ISIS propagandist Ahmad Abousamra according to the New York Post:

Abousamra’s father, a prominent doctor, even sat on the board of directors of the Muslim organization that runs the mosque. He stepped down after the FBI began questioning his son.

The FBI suspects Abousamra now operates ISIS’s sophisticated media wing promoting the group’s beheadings and other atrocities through slick videos posted on the Internet. The brutally effective English-language propaganda campaign has helped attract thousands of Western jihadists, including at least 300 Americans.

The FBI says Abousamra, 32, traveled to Pakistan and Yemen to train to kill Americans while enrolled at Boston colleges. He justified murdering civilians because “they paid taxes to support the government and were kufar [nonbelievers],” Boston FBI Agent Andrew Nambu testified in an affidavit.

Another agent, Heidi Williams, says Abousamra, who has a $50,000 bounty on his head, was inspired by the 9/11 attacks and, in fact, “celebrated it.”

Abousamra, Alamoudi, and the Tsarnaev brothers are far from being the only suspicious figures to go through the mosque. There are several others, to include Muslim Brotherhood’s spiritual leader Yusuf al-Qaradawi, who has been identified as a trustee of the mosque.