According to US TV channels and Associated Press, there was a third explosion, at the John F. Kennedy Presidential Library and Museum in Boston.

Reuters reported that there was a fire at the library. The third blast occurred more than an hour later. No injuries were reported, police said

At least two explosions shattered the festive air at the end of the grueling Boston Marathon on Monday, leaving at least two people dead and injuring as many as 50.

Investigators have a suspect — a Saudi Arabian national — in the horrific Boston Marathon bombings, The New York Post reported.

The report said quoting law enforcement sources that the 20-year-old suspect was under guard at an undisclosed Boston hospital. The man was caught less than two hours after the 2:50 p.m. bombing on the finish line of the race, in the heart of Boston.