Dzhokar Tsarnaev, who has been arrested for the terrorist bombings in Boston, attended the Islamic Society of Boston (ISB) in Cambridge, a mosque with strong Muslim Brotherhood links. The ISB Cultural Center, which is at a separate location, is even run by a group that federal prosecutors said in 2008 "was founded as the overt arm of the Muslim Brotherhood in America."
An ISB attendee reports last seeing Tsarnaev there during Ramadan last year. It is unclear if his brother, the other bomber, also attended the mosque. The ISB has links to the Muslim Brotherhood, has had radical leadership and promotes anti-Western themes.
For instance, the Islamic Society of Boston recently invited journalist Victoria Brittain to speak at the mosque, who in an article she wrote on MichaelMoore.com wrote that the War on Terror is a "war on Islam" and that Muslims in the West face widespread persecution. In her article, Brittain also criticized British security services who "returned to a post-9/11 stance on overdrive" in the aftermath of the 2005 London subway bombings, referred to as the "7/7″ attacks.