From a press conference addressing the atrocities in Boston. The full article is here.

Corey Saylor, legislative director for CAIR, said the group feared reprisals.
"We're very concerned, because in past instances some individuals have decided to go out and target further innocent people because they look different or belong to a faith that is a minority," Saylor said.

One reporter asked the leaders gathered at the news conference how they could combat radical videos that pop up on social media.

Saylor said community leaders have forcefully pushed back against what they consider radical elements of the faith.

"Unfortunately every faith has within in it heretical elements, and unfortunately young people in general will listen to those elements." (Note: I corrected myself at the event, but I intended to say "some" people, not young people.)

Saylor said he and other leaders would continue to push back against the heretical element "loudly and clearly."

"We will stand up, we will push back against extremists, and I'm very comfortable we'll win against them eventually."