Two explosions at Boston marathon finish line Authorities are investigating a report of two explosions at the finish line of the Boston Marathon. / CBS Boston   BOSTON Several people have been hurt in two explosions near the Boston Marathon finish line, CBS Boston reports. There were two booms heard from near the finish line inside the Fairmount Copley Plaza Hotel. It happened around 2:45 p.m. outside Marathon Sports on Boylston Street, according to WBZ-TV's Lis Hughes, who was near the scene covering the marathon. There were two "incredibly powerful explosions just seconds apart," according to Hughes. Watch live finish line camera here on CBS Boston Race officials locked down the hotel because of the report. The sound of two booms, which sounded like thunder, had come a short time earlier.