Pressure cookers may have been used in marathon attack. Fox News
AUTHORITIES investigating the deadly bombings at the Boston Marathon have recovered a piece of circuit board that they believe was part of one of the explosive devices, and also found the lid of a pressure cooker that apparently was catapulted onto the roof of a nearby building.
A law enforcement official briefed on the investigation confirmed that authorities have recovered what they believe are some of the pieces of the explosive devices. The official spoke on condition of anonymity because this person was not authorided to publicly discuss evidence in the ongoing investigation.
A person close to the investigation previously said the bombs consisted of explosives put in 6L pressure cookers, one with shards of metal and ball bearings, the other with nails.
Also today, a doctor at Boston Medical Center said two patients, including a 5-year-old child, remain in critical condition there. Dozens of others have been released from hospitals around Boston.
The crude, kitchen-made bombs, likely set off by timing devices, are commonly used in Afghanistan and have been featured in a how-to guide published by the Al Qaida-linked Inspire magazine. Extremist websites also detail how to make the cooker explosives.
Two men in hazardous materials suits put numbers on the shattered glass and debris as they investigate the scene at the first bombing.
Photographs of the twisted metal pressure cookers and shredded black bags have been released.
The day after: The developments of the past 24 hours
Investigators trying to determine if the attack was a homegrown act or the work of foreign terrorists are still scouring the twin blast sites near the marathon finish line."This will be a worldwide investigation. We will go to the ends of the Earth to identify the subject or subjects responsible for this despicable crime," Boston's chief FBI agent Rick Delauriers said.
Fox News has released an image of what appears to be an exploded backpack at the scene of the Boston bombings.
"Someone knows who did this," Mr DesLauriers said. "Importantly, the person who did this is someone's friend, neighbour, co-worker or relative."
More than 6000 videos and images of the scene have reached authorities, including one image showing a man in black shredded clothes moving away from the blast site.
Authorities appear to have no suspects after raiding the home of a Saudi student who they said was a witness, not a suspect.
Another image of a light-coloured package at the feet of unsuspecting spectators at one of the blast sites was given to a news organisation. The package was absent in photographs taken in the aftermath of the bomb.Images from the Department of Homeland Security show improvised explosive devices using pressure cookers.
Horrified doctors told of treating some of the more than 180 injured, who had dozens of nails and metal fragments embedded in their bodies. Thirteen lost at least one limb.
"We just finished the job that the bomb did. Their limbs were completely mangled," Massachusetts General Hospital chief trauma surgeon George Velmahos said.
He said up to 40 "nails or sharp objects" were removed from some patients.
Severe leg injuries suggest the the bombs were placed on the ground.
Hundreds of mourners gather at Boston Common for a candelight vigil.
US President Barack Obama will attend a service in Boston on Friday to honour the three spectators killed - eight-year-old Martin Richard, restaurant manager Krystle Campbell, 29, and student Lu Lingzi, 23, from China.
"Any time bombs are used to target innocent civilians, it is an act of terror," he said.
"What we don't yet know, however, is who carried out this attack, or why; whether it was planned and executed by a terrorist organisation, foreign or domestic or was the act of a malevolent individual."
The two bombs that exploded at the Boston Marathon have raised fresh alarms about terrorism in the US.
"The presence of a pressure cooker in an unusual location, such as a building lobby or busy street corner, should be treated as suspicious," the warning reads.
Al-Qaida's branch in Yemen gave a detailed description of how to make a bomb using a pressure cooker in a 2010 issue of Inspire, its English-language online publication aimed at would-be terrorists acting alone.
In a chapter titled "Make a bomb in the kitchen of your mom," it says "the pressurised cooker is the most effective method" for making a simple bomb, and it provides directions.
Naser Jason Abdo, a former US soldier, was sentenced to life in prison last year after being convicted of planning to use a pair of bombs made from pressure cookers in an attack on a Texas restaurant frequented by soldiers from Fort Hood. He was found with the Inspire article.
Tributes to the victims continue to flow and 1000 people gathered at a vigil for Martin Richard. Boston Red Sox players dedicated their win over the Cleveland Indians to their city.
"We're not getting anyone out of surgery with a win or loss," player Jonny Gomes said.
"The main thing is to show the Boston Red Sox aren't laying down to this. We're going to keep trucking, and hopefully set that character, that attitude, throughout the city."
These images show the devastation caused by the bombing - and the massive emergency services operation as authorities scrambled to help the injured and search for more devices.
Security will be tight at this weekend's London Marathon.
It was confirmed yesterday that Prince Harry, who is a patron of the event, will still attend to hand out medals to competitors.
People in hazardous materials suits investigate the scene at the first bombing on Boylston Street in Boston.
Amateur video shot from a reviewing stand shows the aftermath of two explosions near the finish line of the Boston Marathon. Rough Cut (no reporter narration).
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