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.