2 bombas Maratona de Boston; explosão atinge 3 JFK Biblioteca

2 deadly bombs strike Boston Marathon; 3rd blast strikes JFK Library

By Josh Levs, CNN

April 15, 2013 -- Updated 2111 GMT (0511 HKT)

(CNN) - Duas bombas atingiu perto da linha de chegada da Maratona de Boston nesta segunda-feira, matando duas pessoas e ferindo dezenas de outras.

Uma explosão terceiro seguido no John F. Kennedy Presidential Library, que as autoridades acreditam que foi relacionado, o comissário de polícia de Boston Ed Davis.

Figuras de três hospitais, colocar o número de feridos das explosões maratona tão elevadas como 51.

As explosões, perto da linha de chegada, enviou fumaça para o ar na Copley Square, transformando um local de celebração em uma confusão de destruição.

"Parecia um canhão enorme", disse uma testemunha à CNN sobre uma das explosões.

"It felt like a huge cannon," a witness told CNN about one of theblasts.

Authorities in Boston found at least one other explosive device that they were dismantling, Davis said.

Blasts near Boston Marathon finish line

Eyewitness: People 'very badly hurt'

It was unclear who may have planted the bombs. There were no credible threats before the race, a state government official said.

The Marriott hotel at Copley Place was evacuated as a precaution.

The Lenox Hotel was also evacuated as a precaution, the Boston Globe reported.

Massachusetts General Hospital said it was treating 22 injured people, six of them in critical condition. Tufts Medical Center reported that it was treating nine people. Brigham and Women's Hospital said it received between 18 and 20 injured. Combined, that brings the number of injured to as many as 51.

Police said both bombs at the marathon, 50 to 100 yards apart, left casualties. The full number was not immediately known, Davis said.

Crowds were in the area watching the runners.

"This is a horrific day in Boston," Massachusetts Gov. Deval Patrick said in a statement.

"My thoughts and prayers are with those who have been injured. I have been in touch with the President, Mayor (Thomas) Menino and our public safety leaders. Our focus is on making sure that the area around Copley Square is safe and secured. I am asking everyone to stay away from Copley Square and let the first responders do their jobs."

U.S. Attorney General Eric Holder spoke with FBI Director Robert Mueller and U.S. Attorney Carmen Ortiz, a Justice Department official said.

Holder has directed the full resources of the Justice Department to be deployed to ensure the matter is fully investigated, the official said.

The Federal Aviation Administration placed a flight restriction over the site of the blasts.

Other cities, including New York and Washington, tightened security as a result. Following standard protocol, the White House cleared out an area in front of the West Wing.

"If you see something, say something," Mark Boughton, mayor of Danbury, Connecticut, wrote on Twitter. "All cities will be on a heightened state of alertness per Homeland Security protocols."

Mike Baingon, who works at the Atlantic Fish Company in Boston, said an explosion took place in front of the restaurant and that he was right by the front door at the time.

The explosions occurred at about 2:45 p.m., more than two hours after the first of the race's nearly 27,000 runners had crossed the finish line, CNN Producer Matt Frucci reported.

The race was halted as was subway service into the area.

Runners east of Massachusetts Avenue were directed to Boston Common; those west of Massachusetts Avenue were directed to Kenmore Square, the state's emergency management agency said.Troops from the Massachusetts National Guard were assisting police as well.

A woman is comforted by a man after two apparent bombs go near the finish line of the Boston Marathon on Monday, April 15. Read our developing news story and follow up-to-the-minute reports on CNN.com's Just In blog.

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Explosions rock Boston Marathon