
President Barack Obama vowed to bring the perpetrators to justice as an investigation was launched. There were no suspects in custody and Obama stopped short of calling the incident a terrorist attack, but an unnamed White House official later said it was "clearly an act of terror."
There were "simultaneous explosions" at 2:50 pm (1850 GMT) about 50 to 100 metres apart with "multiple casualties," Boston police commissioner Ed Davis said at a press conference.
The winners had already crossed the finish line when the explosions occurred, but thousands of other runners were still on the course of the elite marathon in which about 26,000 runners participated. Organizers immediately cleared the area near the finish line and stopped the race.//DPA