Two people have been killed and 23 injured after two explosions at the finish line of the Boston Marathon, police say.
The blasts shattered the carnival atmosphere of one of the biggest sporting events in the US, causing panic and confusion.
A third explosion occurred at the JFK Library in the city, Boston police have confirmed.
The cause of the explosions has yet to be identified.
The first explosion came at about 14:50 local time (18:50 GMT), approximately two hours after the winners crossed the line.
Mike Mitchell of Vancouver, Canada, a runner who had finished the race, said he was looking back at the finish line when he saw a “massive explosion.”
Smoke rose 50ft (15m) in the air, he told Reuters news agency, and people began running away and screaming after hearing the noise. “Everybody freaked out,” he said.Read More:
Sources told the New York Post that up to 12 people had been killed in the two blasts, and further reported that a suspect is in custody at a Boston-area hospital and is being closely guarded.
A source who was speaking with authorities told MailOnline that there were shotgun shells in two explosions, which sprayed onlookers and runners with massive amounts of shrapnel, though the statement has not been confirmed by authorities.
CBS News reports that police are now looking at surveillance video showing someone carrying multiple backpacks into the area about 20 minutes before explosions.
One witness said ‘there was blood everywhere.’
Boston’s Lenox Hotel that serves as the headquarters for the Boston Marathon was locked down on Monday after a security incident near the finish line. Two blasts were heard by reporters in the media center. Read more: