Amid the continuing investigation into the Boston Marathon bombing, President Obama this week spoke of the threat of self-radicalized individuals here in the U.S. and the difficulty of identifying them. He said his counterterrorism team has discussed ways it can engage communities where such radicalization can occur.

In recent years, American Muslim groups have launched their own efforts to combat extremism. Watch our conversation this week with Haris Tarin, director of the Washington office of the Muslim Public Affairs Council.