Firefighters and police officers using heavy machinery continued to move rubble from the site of the blast as special investigators examined the site for clues to the cause of the explosion.
Mr. Wilson added that 133 people were removed from an assisted-living facility near the blast site.
Government members were meeting in the building near the blast site at the time.
Concrete chunks, some the size of shopping carts, are strewn hundreds of yards away from the blast site.
Rescue and recovery teams have been using heavy machinery to move rubble from the site of the blast.
At the blast site, members of the Hazara community helped authorities dig through rubble to find the dead or survivors.
She worried even more about her daughter and mother-in-law who were standing across from the blast site, outside the Lennox Hotel.
At the site of the blast, family and friends were looking through the rubble for family members missing after the explosion.
On Wednesday, investigators in white jumpsuits fanned out across the streets, rooftops and awnings around the blast site in search of clues.
Mr. Haggerty walked around the fencing and into the blast site, where he and another man helped carry a man who was clearly in bad shape.
While looking for Richard they helped pull several people out of the bar and removed debris from the road to allow emergency services better access to the blast site.
Because of continuing fires and the threat of toxic emissions and additional explosions, authorities were struggling to search some of the most heavily damaged areas near the blast site, but they planned to eventually go door-to-door and scour the entire area for survivors.
Kenneth Feinberg spoke Monday evening at a Town Hall meeting at the Boston Public Library, near the blast site, and said the families of those who lost loved ones and individuals who suffered double amputations or permanent brain damage would receive the highest category of payment.
Investigators said the men were recorded walking on Boylston Street and they encouraged anyone who had been at the Forum Restaurant, near the second blast site, to contact the FBI in the hopes they might be able to provide even a small scrap of new information that would help them find the men.
Reports suggest he was also seen loitering around the site of the bomb blast in Oslo two hours before the island incident.
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The source said the tree -- located at the site of the second blast -- was removed along with the surrounding grate, where the explosive device's circuit board was found.
The possible breakthrough came from an analysis of video from a Lord and Taylor department store near the site of the second blast, and video from a Boston TV station helped as well, the official said.
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U.S. law enforcement sources said investigators have discovered remnants of timing devices that may have been used in the train explosions -- but that no such fragments have been found at the site of the bus blast.
The team, made up of fewer than a dozen people, will help authorities in Baghdad investigate the blast by inspecting and analyzing evidence at the site.
Spending a day with Fisk on his 18-acre work site outside of Austin, Texas is like riding a rocket blast into the future.
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On the edge of the site is the Survivor Elm, a tree damaged but not destroyed in the blast.
Just hours after the blast, U.S. Secretary of State Hillary Clinton visited the site to see the damage for herself.
If an aggressor launches a nuclear device of whatever size and detonates it above the atmosphere and in the line of site of its target country, the x-rays and gamma rays emitted by the blast will cause an electromagnetic pulse, or wave a million times stronger than the strongest radio wave.
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