In this Monday, April 15, 2013, file photo, an emergency responder and volunteers, including Carlos Arredondo, in the cowboy hat, push Jeff Bauman in a wheelchair after he was injured in one of two explosions near the finish line of the Boston Marathon.
Authorities are investigating a report of two explosions at the finish line of the Boston Marathon.
There were two booms heard from near the finish line inside the Fairmount Copley Plaza Hotel.
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.