FBI Searches Boston Apartment in Bomb Investigation
1/15In this image from video provided by WBZ-TV, spectators and runners run from what was described as twin explosions that shook the finish line of the Boston Marathon, April 15, 2013.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
2/15An emergency responder and volunteers, including Carlos Arredondo in the cowboy hat, push Jeff Bauman in a wheel chair after he was injured in an explosion near the finish line of the Boston Marathon April 15, 2013.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
3/15Medical workers transport the injured across the finish line during the 2013 Boston Marathon following an explosion, April 15, 2013.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
4/15Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion, April 15, 2013.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
5/15One of the blast sites on Boylston Street near the finish line of the 2013 Boston Marathon is investigated by two people in protective suits in the wake of two blasts in Boston April 15, 2013.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
6/15Runner John Ounao cries when he finds friends after several explosions rocked the finish of the Boston Marathon, April 15, 2013.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
7/15A police officer clears Boylston Street following an explosion at the finish line of the 2013 Boston Marathon, April 15, 2013.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
8/15Medical workers aid a wounded woman at the finish line of the 2013 Boston Marathon following two explosions there, April 15, 2013.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
9/15Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston, April 15, 2013.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
10/15A woman is comforted by a man near a triage tent set up after explosions went off at the 117th Boston Marathon, April 15, 2013.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
11/15A Massachusetts state police officer guards the area containing the medical tent, rear, following an explosion at the 2013 Boston Marathon, April 15, 2013.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
12/15An unidentified Boston Marathon runner leaves the course crying near Copley Square following an explosion, April 15, 2013.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
13/15A Boston police officer wheels in injured boy down Boylston Street as medical workers carry an injured runner following an explosion during the 2013 Boston Marathon, April 15, 2013.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
14/15Justine Franco of Montpelier, Vermont, holds up a sign near Copley Square looking for her missing friend, April, who was running in her first Boston Marathon, April 15, 2013.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
15/15President Barack Obama leaves the podium after speaking in the press briefing room at the White House, April 15, 2013, following the explosions at the Boston Marathon.
Two explosions occurred near the finish line at the Boston Marathon on April 15, about four hours after the start of the race. At least three people were killed, and more than 170 were wounded.
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U.S. federal investigators searched an apartment in the suburban Boston town of Revere in the effort to find whoever was behind Monday's twin bombings at the Boston Marathon.
At least three people were killed and more than 140 others injured.
Investigators removed items from the apartment. No arrests have been made, and authorities are not commenting about any potential suspects.
The Federal Bureau of Investigation (FBI) is leading the multi-agency effort to investigate what a White House official said was "clearly an act of terror."
Two police officers walk down Boylston Street, away from the finish line of the Boston Marathon in Boston, Massachusetts April 16, 2013. Two bombs packed with ball bearings tore through crowds near the finish of the Boston Marathon, killing three people.
The explosions happened moments apart, within about 100 meters of each other, near the finish line.
No one has claimed responsibility for the blasts. President Barack Obama said those responsible will be found and held accountable.
"We still do not know who did this or why," Obama said in a televised statement. "And people shouldn't jump to conclusions before we have all the facts. But, make no mistake, we will get to the bottom of this, and we will find out who did this. We will find out why they did this. Any responsible individuals, any responsible groups, will feel the full weight of justice."
Early Tuesday, investigators were working in a wide area around the bombing scene. Heavy security was evident around the city, but otherwise the streets were mostly empty of people.
Location of the marathon finish line in Boston, Massachusetts, where two deadly explosions occurred.
VOA correspondent Carolyn Presutti described the scene around the bomb sites.
Boston Police Commissioner Edward Davis said there was "no specific intelligence" warning of an attack.
The Boston Globe, citing two law enforcement sources, reported that the dead included an eight-year-old boy. A number of victims suffered amputations.
The blasts took place about four hours into the race, long after the winners had finished, but at the time a high number of runners and their supporters are usually around the finish line area. The competition, which attracted more than 23,000 runners from around the world, was halted after the bombs went off.
Azeem Khan, a Pakistani-American runner who was three miles from the finish line at the time of the explosions, said it had been a "joyful day" up until then.
"Running the race, it was such an amazing experience," Khan said. "The joy of the people is what helped me keep going when I was so tired and how everyone was out. The entire state of Massachusetts was out. Little kids, even if they weren't part of the marathon staff, little kids hanging around with Dixie cups and people who baked cookies for us, and people were handing out food and telling us to keep going and giving us handshakes as we were running. It was just such a joyful day, and to turn such a joyful day into massacre like this, just can't help you but feel anything but anger."
Heightened security worldwide
Cities worldwide stepped up security following the explosions.
Deadly bombings in the United States
Deadly bombings in the United States
April 15, 2013: Twin blasts at the Boston Marathon kill at least 3, injure more than 140
September 11, 2001: Hijacked jets crash into World Trade Center, Pentagon and a Pennsylvania field killing nearly 3,000
July 27, 1996: Atlanta Summer Olympics bombing kills 2, injures more than 100
April 19, 1995: Car bomb at Oklahoma City federal building kills 168, injures more than 500
February 26, 1993: Van explosion in World Trade Center garage kills 6, injures more than 1,000
December 29, 1975: Bomb at New York's LaGuardia Airport kills 11, injures 75
September 16, 1920: Bombing in New York's Wall Street area kills 40, injures hundreds
In Britain, police said they are reviewing security plans for Sunday's London Marathon, the next major international marathon.
New York City officials said police have increased security in the city, including near prominent hotels, in response to the blast.
Washington, D.C. and Los Angeles also are on a heightened state of alert.
Officials in Boston said an electrical fire that broke out at the John F. Kennedy Library a few kilometers from the marathon's finish line was not related to the bombings.
Shortly after the explosions, the U.S. Secret Service shut down Pennsylvania Avenue outside the White House, cordoning off the area with yellow police tape. But the White House is not on lockdown.
President Obama called Boston Mayor Tom Menino and Massachusetts Governor Deval Patrick and told them his administration will provide whatever assistance is necessary in the investigation and response.
Boston is a major metropolis located in the northeastern U.S. The marathon, a significant event the city hosts every year, corresponds with the annual Patriot's Day holiday and attracts runners and spectators from all over the world.
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