Just before 3 p.m. Monday at least two explosions ripped out along the final mile of the Boston Marathon. Video footage shows spectators fleeing and at least one runner seeming to trip over a projectile.
CNN and Boston police are reporting that there are two people dead and more than 20 others wounded. The New York Post, however, cites a federal law enforcement source in its reporting that there are at least a dozen fatalities and 50 injured.
Monday is a statewide holiday in Massachusetts called "Patriots' Day," which celebrates the anniversary of the battles of Lexington and Concord. Thousands of spectators lined the route of the famous annual race before the explosions.
Pandemonium followed the blasts.
Photos shared on Twitter and other social media websites showed the explosions and blood smeared on sidewalks.
Boston City Council President Stephen Murphy told the Boston Herald he was "30 to 40 feet" from the explosions.
"I heard an explosion and then another one 15 seconds later," he told the Herald. "I saw a guy coming towards me with blood on his face."
The race started in waves around 10 a.m. The race's winner, Lelisa Desisa of Ethiopia, won the race with a time of 2 hours, 10 minutes and 22 seconds, The Associated Press reported. The victors had already crossed the finish line by the time the explosions happened.