Officials: Boston bombers motivated by attacks on Islam

New details Tuesday night about what motivated Dzhokhar Tsarnaev and his brother Tamerlan to carry out the Boston marathon terror attacks that killed three and wounded more than two hundred others.

According to government officials, Dzhokhar told investigators the wars in Afghanistan and Iraq were the reasons they decided to set off the deadly bombs.

But how did these two Chechen immigrants become self-radicalized jihadists?

Our David Mattingly is Outfront with the story.