-
An expert on terrorism and security says investigators in Boston are looking for minute clues in bomb debris that could point to a suspect, and also turning to race spectators who might have captured evidence. "That was one of the most photographed sites on the planet yesterday," he says.
-
With cellphone service hopelessly congested, many people turned to Twitter and Facebook to report their whereabouts or find out if family and friends attending the race were OK.
-
The investigation into the explosions that killed three and injured dozens continues. We're tracking developments.