Hunt for Suspects, Motives in Boston Bombing 'Wide Open' - Fox News.
The FBI and state and local police are intensifying their probe into Monday's bombing at the finish line of the Boston Marathon, vowing a "worldwide investigation" and appealing to the public for tips and cell phone pictures that might yield clues about who was behind the horrific attack.
"At this time there are no claims of responsibility," FBI officials said in a press conference Tuesday. "The range of suspects and motives remains wide open."...