(Washington) -- A senior U.S. intelligence official says two more explosive devices have been found near the scene of the Boston marathon where two bombs detonated earlier.
The official said the new devices were being dismantled.
It was not immediately clear what kind of devices had been found today. The official said the first two did appear to be bombs.
The official spoke on condition of anonymity because he was not authorized to discuss the findings publicly.
The official said it was not clear what the motive was or who may have launched the attack.
The Federal Aviation Administration is warning pilots it has created a no-fly zone over the site of two explosions at the annual Boston marathon.
The agency said in a notice issued about an hour after the explosions that a no-fly zone with a 3.5-mile radius has been created over 811 Boylston Street. The zone is limited to flights under 3,000 feet in altitude, which is lower than most airliners would fly except when taking off or landing.
The notice says the no-fly zone is effective immediately and will remain in effect until further notice. Pilots planning flights were urged to call their local flight service station.
One runner says he saw at least two dozen people with very serious injuries at the finish line of the Boston Marathon, after the twin explosions there. The runner, a Rhode Island state trooper, says the injuries included missing limbs.
Race organizers and police say two people were killed and nearly two dozen others were injured when two bombs exploded near the finish line, about three hours after the winners had completed the race.
Competitors and race volunteers were crying as they fled the chaos and as bloody spectators were carried to the medical tent that had been set up to care for fatigued runners.
Authorities went onto the course to carry away the injured. Those who hadn't yet finished the race were rerouted away from the area.
Smoke rose from the blasts, fluttering through the flags lining the route. TV helicopter footage showed blood staining the pavement in the popular shopping and tourist area known as the Back Bay.
Two people are reported dead with at least 23 others injured.
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