A sign outlining "obligatory prayers" hangs on the sanctuary at the Islamic Society of Boston mosque in Cambridge, Mass., on Friday, April 19, 2013. A mosque official confirmed that the two suspects in the Boston Marathon bombings, who lived a short distance away, worshipped there occasionally. Tamerlan Tsarnaev ranted at a neighbor about Islam and the United States. His younger brother, Dzhokhar, relished debating people on religion, "then crushing their beliefs with facts." (AP Photo/Allen Breed)

Associated Press
A sign outlining "obligatory prayers" hangs on the sanctuary at the Islamic Society of Boston mosque in Cambridge, Mass., on Friday, April 19, 2013. A mosque official confirmed that the two suspects in the Boston Marathon bombings, who lived a short distance away, worshipped there occasionally. Tamerlan Tsarnaev ranted at a neighbor about Islam and the United States. His younger brother, Dzhokhar, relished debating people on religion, "then crushing their beliefs with facts."   (AP Photo/Allen Breed)
A sign outlining "obligatory prayers" hangs on the sanctuary at the Islamic Society of Boston mosque in Cambridge, Mass., on Friday, April 19, 2013. A mosque official confirmed that the two suspects in the Boston Marathon bombings, who lived a short distance away, worshipped there occasionally. Tamerlan Tsarnaev ranted at a neighbor about Islam and the United States. His younger brother, Dzhokhar, relished debating people on religion, "then crushing their beliefs with facts." (AP Photo/Allen Breed)
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