Competitors and race helpers engulfed by bomb chaos

US authorities scrambled to tend to dozens of maimed and wounded people after two bombs exploded at the finish of the Boston Marathon.

Two people were confirmed dead and local media reported that more than 100 people were treated in hospital. The Boston Globe reported that some had to have limbs amputated.

There were no initial suspects or groups claiming the incident, though there were reports that additional devices had been found and defused. Fox News reported that a “person of interest” had been taken into custody, but there were no details beyond that.