BOSTON — Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers in the 26.2-mile trek from Hopkinton were rerouted away from the smoking site of the blasts.
A federal law-enforcement source told The Post there are at least 12 dead and nearly 50 injured. Fox News reported that Massachusetts General Hospital was treating 10 people with amputated limbs and all operating rooms were on hold.
Law-enforcement sources said at least the first explosion occurred in the lobby of the Fairmont Hotel.
"There were two bombs that exploded near the finish line in today's Boston Marathon," The Boston Marathon's official Facebook page read. "We are working with law enforcement to understand what exactly has happened."
According to reports, authorities in Boston found a third explosive device that had not gone off and police were going to perform a controlled explosion. The airspace above the city was ordered cleared as well.
“This changes everything [in New York],’’ one source told The Post. “Everyone’s on high alert. Our marathon was canceled in November. Who knows if that changed someone’s plans?’’
In New York, the NYPD has ramped up its anti-terror efforts at landmarks and other potential terrorist targets “to make sure there’s no nonsense going on here,’’ a law-enforcement source said.
Officers are scouring live feed from surveillance videos throughout the city to monitor possible events, the source said.
NYPD Deputy Commissioner Paul Browne said that the NYPD has deployed its Critical Respons Vehicles as well until more about the explosion is learned.
The FDNY says their units have also been advised to use elevated caution due to the explosions.
Relatives of the victims of December’s school massacred in Newtown, Conn. were among those attending the race finish at a VIP area. It was not known of any of the relatives were among the casualties.
A White House official said President Obama was getting updates on the apparent bombing.
Competitors and race organizers were crying as they fled the chaos. Bloody spectators were being carried to the medical tent that had been set up to care for fatigued runners.
"There are a lot of people down," said one man, whose bib No. 17528 identified him as Frank Deruyter of North Carolina. He was not injured, but marathon workers were carrying one woman, who did not appear to be a runner, to the medical area as blood gushed from her leg. A Boston police officer was wheeled from the course with a leg injury that was bleeding.
About three hours after the winners crossed the line, there was a loud explosion on the north side of Boylston Street, just before the photo bridge that marks the finish line. Another thunderous explosion could be heard a few seconds later.
Runner Laura McLean of Toronto said she heard two explosions outside the medical tent.