The FBI said Tuesday it is co-ordinating a "worldwide investigation" into the twin bomb blasts that killed three people and wounded more than 170 others near the Boston Marathon finish line.
"We will go to where the evidence and the leads take us," FBI special agent Rick DesLauriers said at a media briefing a day after the explosions.
"We will go to the ends of the earth to identify the subject or subjects who are responsible for this despicable crime, and we will do everything we can to bring them to justice," he said.
Both Boston Police Commissioner Edward Davis and Gov. Deval Patrick clarified earlier reports that said up to seven unexploded bombs may have been found in the city, confirming that only two bombs were involved in the attack.
The FBI agent wouldn't comment on the "nature of the devices" that exploded within 10 seconds of each other on Boylston Street in Copley Square. On Monday, he told reporters police are looking at a "potential terrorist investigation."
The near-simultaneous explosions occurred near the finish line — about 45 to 90 metres apart.
Davis on Tuesday said there were 176 casualties altogether. Seventeen of them were in critical condition, and three died.
Boston Globe photographer John Tlumacki said the bombs went off 1½ hours after the first runners crossed the finish line.
"The initial blast jolted me and dropped a runner onto the ground." That man, who suffered minor injuries, has been identified as 78-year-old Bill Iffrig of Washington state, who was running his third Boston Marathon.
So far, there has been no word on the motive for the attack or who may have launched it.
State police said officers with a search warrant related to the investigation searched a fifth-floor apartment unit Monday night in the Boston suburb of Revere, but provided no further details. Investigators were seen leaving the building early Tuesday carrying brown paper bags, plastic trash bags and a duffel bag, according to The Associated Press.
Following Obama's remarks, one White House official said that "any event with multiple explosive devices — as this appears to be — is clearly an act of terror, and will be approached as an act of terror."
The Pakistani Taliban have threatened to attack the U.S. in the past, but the group's spokesman Ahsanullah Ahsan denied involvement in a telephone call with The Associated Press.
The Boston Marathon is held on Patriots Day, a civic holiday that commemorates one of the first battles of the American Revolution.
Boy killed was watching father race
One of those killed was an eight-year-old boy identified in local media reports as Martin Richard of Boston's Dorchester neighbourhood. He was watching his father race. There were reports mother and sister were critically injured.
Eight hospitals said they were involved in treating people. The injuries ranged from cuts and bruises to amputations. Many victims suffered lower-leg injuries and shrapnel wounds. Some suffered ruptured eardrums.
Among the badly injured spectators are two brothers, ages 31 and 33, from the Boston area, who each lost a leg from the knee down.
Dr. Natalie Stavas, a pediatric doctor in Boston who was running in the marathon. was one of many people who raced to the scene to help treat the injured.
"I was a critical care nurse for quite some time and have worked in trauma emergency rooms, and none of that prepared me for the devastation and the horror that was at the finish line," she said.
Dr. Peter Fagenholz of Massachusetts General hospital said doctors at the facility have performed "several amputations."
He added they were seeing signs of shrapnel-type injuries, but couldn't say if it was from the explosive devices. CNN reports amputations have been carried out on 10 patients.
Investigators are examining the remains of the explosive devices, described as relatively small and crude.
Foreign Affairs officials told CBC News that there were no reports of any Canadians injured in the blasts.
The twin blasts shattered windows and sent dense plumes of smoke rising over the street. Emergency workers and national guardsmen assigned to the race for crowd control began climbing over and tearing down temporary fences to get to the blast site.
Boston police said an incident at the John F. Kennedy Presidential Library and Museum that was initially thought to be another blast was being treated as a fire and not believed to be related to the two bomb blasts.
'Crying as they fled the chaos'
Competitors and race organizers were crying as they fled the chaos. Bloody spectators were carried to the medical tent that had been set up to care for fatigued runners.
Roupen Bastajian, a 35-year-old state trooper from Smithfield, R.I., had just finished the race when they put the heat blanket wrap on him and he heard the blasts.
"I started running toward the blast. And there were people all over the floor," he told The Associated Press. "We started grabbing tourniquets and started tying legs. A lot of people amputated …. At least 25 to 30 people have at least one leg missing, or an ankle missing, or two legs missing."
"They just started bringing people in with no limbs," runner Tim Davey, of Richmond, Va., told the Associated Press. He said he and his wife, Lisa, tried to keep their children's eyes shielded from the gruesome scene inside a medical tent that had been set up to care for fatigued runners, but "they saw a lot."
"They just kept filling up with more and more casualties," Lisa Davey said. "Most everybody was conscious. They were very dazed."
According to the Boston Marathon website, 2,078 Canadians were listed as entrants among the 27,000 people in the race.
Michael Doyle, a Canadian who was in the marathon, said he heard sirens and "quite a bit of commotion" on Monday afternoon. "Then I heard there were two explosions, one of them close to the finish line, another further up."
"It's [a] very surreal situation," the web producer for Canadian Running magazine told CBC News.
"As I was making my way closer to the scene here, it was a mixture of people who were very upset and crying, and who seemed to be cognizant of what was going on, and those who I think were completely unaware of the situation," he said.
Runner Laura McLean of Toronto said she heard two explosions outside the medical tent.
' It just sounded like an absolute war zone. People were crying, on the pavement, like sitting down with their head between their knees. Everyone was on their phone, obviously calling loved ones to let them know they were OK.'—Kirsten-Ellen Fleming of Calgary
"There are people who are really, really bloody," McLean said. "They were pulling them into the medical tent."
Calgary's Kirsten-Ellen Fleming had been watching the race near the finish line and then headed into a restaurant on the corner of Boylston and Newbury streets.
"We were coming out of the restaurant and there were two big explosions and a bunch of smoke.… It was just immediate chaos and mayhem and confusion," she said.
Boston police said the explosions occurred near the finish line — about 45 to 90 metres apart — and resulted in 'multiple casualties.' (CBC) "Everyone was just in utter shock and looking around."
Some runners were still going and confused, she said. "Within a very short amount of time, minutes, there were just sirens everywhere. It just sounded like an absolute war zone. People were crying, on the pavement, like sitting down with their head between their knees. Everyone was on their phone, obviously calling loved ones to let them know they were OK."
Marathon runner Lisa Bentley described the initial explosion to CBC News, saying she "heard this big explosion, and then felt the ground shake."
Bentley, who believes she was between 100 and 200 metres from the finish line, said that "very soon after" she felt another big bang, followed by more shaking.
"We didn't know what had happened at all — we just started seeing the lights and the sirens and the emergency vehicles and we thought we've just got to get away from here, so we kept walking away from the finish line," said Bentley, who had already finished the race at the time of the explosion.
After the attack, U.S. President Barack Obama cautioned that "we still do not know who did this, or why. People shouldn't jump to conclusions before we have all the facts."
"But make no mistake, we will get to the bottom of this. We'll find out who did this, we'll find out why they did this. Any responsible individuals, any responsible groups will feel the full weight of justice."
Gov. Patrick said there would be a heightened law enforcement presence in the city and that there may be random checks of people carrying backpacks and parcels.
He asked people to be patient, to be in a state of heightened vigilance and to report any suspicious packages, parcels or suspicious activity.
Meanwhile, security precautions are in place at the Canadian consulate in Boston.
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