At least 20 people were injured and two were killed in a pair of explosions at the Boston Marathon finish line Monday, the Boston Police Department has tweeted. NBC News quotes race organizers as saying the blasts were caused by "two bombs." AP reports that two additional explosive devices were found at the site and were being dismantled. About three hours after the winners crossed the line, there was a loud explosion on the north side of Boylston Street, just before the photo bridge that marks the spot.
Another explosion was heard soon after. Bloody spectators were carried to the medical tent that had been set up to care for fatigued runners. "There are a lot of people down," said one man, whose bib No. 17528 identified him as Frank Deruyter of North Carolina. He was not injured, but marathon workers were carrying one woman, who did not appear to be a runner, to the medical area as blood gushed from her leg. A Boston police officer was also wheeled from the course with a leg injury that was bleeding.