Watch Deval Patrick’s Press Conference on Boston Marathon Explosions

Boston police say two people were killed and 23 people were hurt when a pair of bombs exploded near the finish line of the Boston Marathon.

One runner says he saw at least two dozen people with very serious injuries, including missing limbs. Competitors and race volunteers were in tears as they fled the chaos, and as bloody spectators were carried into the medical tent that had been set up to care for fatigued runners. Police wove through competitors as they ran back toward the course.

Boston police also report a third explosion in the city. Police Commissioner Edward Davis says authorities aren't certain that the explosion at the JFK Library was related to the other blasts, but they're treating them as if they are.

Davis says there are no injuries stemming from the third explosion.

He urged people to stay indoors and not congregate in large groups.

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 Monday. 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.

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.

The White House says President Barack Obama has called Boston's mayor and the Massachusetts governor to express his concern for those injured in the Boston Marathon explosions.

Obama is quoted as telling Mayor Tom Menino (meh-NEE'-noh) and Gov. Deval (deh-VAL') Patrick that his administration would provide whatever support was needed in responding to the incident.

The president was briefed on the explosions by Homeland Security adviser Lisa Monaco shortly after 3 p.m., Eastern time.

Shortly after the explosions, Secret Service shut down Pennsylvania Avenue outside the White House, cordoning off the area with yellow police tape. Several Secret Service patrol cars also blocked off the entry points to the road.

The White House was not on lockdown and tourists and other onlookers were still able to be in the park across the street from the executive mansion.

The Federal Aviation Administration is warning pilots that 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 Monday 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.

Meanwhile, a law enforcement official says cellphone service has been shut down in the Boston area to prevent any potential remote detonations of explosives.

Authorities have not identified what caused the explosives that erupted at the finish line of the Boston Marathon. The official was speaking on condition of anonymity because the investigation was ongoing.

The explosions have killed two people and injured at least 23 others.

Monday's  game between  the Boston Bruins and
Ottawa  Senators  has been postponed  in the  aftermath of the explosions that
occurred at this afternoon's Boston Marathon.

The  contest will be  rescheduled, with the date and time to be announced at a
later date.

The NHL said in a statement, "The National Hockey League wishes to express its
sympathy  to all  affected by  the  tragic events  that took  place in  Boston
earlier this afternoon."