The toll from Monday’s bombing of the Boston Marathon stands at three dead and at least 144 wounded, 17 critically. The two blasts occurred within a 13-second span and just 100 yards apart near the finish line at the historic race. Doctors have reportedly carried out at least 10 amputations on bombing victims, with many patients suffering shrapnel wounds either from the bombs directly or from the resulting debris. It was the worst bombing in the United States since the Oklahoma City attack of 1995. No arrests have been made, and no one has claimed responsibility.

Peace activist Carlos Arredondo has come to be known as "the man in the hat" and widely described as a hero for a viral image of him in a cowboy hat pinching the severed artery of a bloodied, wheelchair-bound victim in the aftermath of the Boston Marathon bombings. Arredondo is no stranger to tragedy: He became a prominent opponent of the Iraq War after his son, Lance Cpl. Alexander Arredondo, was killed in Iraq in 2004. His surviving son, Brian, committed suicide in 2011. Carlos and his wife Mélida, join us to describe witnessing the Boston Marathon bombings and the immediate response to aid the victims.

Boston Marathon Bombing