A few hours into the Boston Marathon and long after the winners had crossed the finish line, two explosions occurred near the Boston Marathon finish line injuring dozens. There have been reports of critical injuries and missing limbs. There has been no confirmation as to the nature of the explosion.

NBC News has more information.

Will Ritter, the spokesman for a Massachusetts Senate candidate, said that he heard what sounded like two explosions and saw smoke rising near the Boston Public Library. He said that he saw three fire engines and police running to the site.

“We heard two really large explosions in rapid succession, about a second apart from each other,” Ritter said. “Everybody kind of ducked and hit the ground.”

Janet Wu, a reporter for NBC affiliate WHDH, told NBC News that she heard two loud explosions. Jackie Bruno, a reporter for New England Cable News, said on Twitter that she saw people’s legs blown off.

“Runners were coming in and saw unspeakable horror,” she said.

Update: 2 Dead, 64 injured.