Pressure cooker devices used in Boston massacre linked to Al Qaeda terror
THE two bombs were placed inside pressure cookers, it emerged last night.
The crude devices appeared to have been packed with shards of metal, nails and ball bearings to inflict maximum carnage.
The FBI said they had found fragments of black nylon possibly from a rucksack used to hide one or both of the bombs.
Homemade bombs built into pressure cookers have been used frequently by militants in Afghanistan, India and Pakistan.
Al Qaeda's branch in Yemen once published an online manual on how to make one, urging "lone jihadis" to carry out attacks.
Homemade bombs built into pressure cookers have been used frequently by militants in Afghanistan, India and Pakistan
No organisation has claimed responsibility for the bombings and the FBI currently has no "definitive information".
Richard DesLauriers, the agent running the investigation, said: "At this time there are no claims of responsibility. The range of suspects and motives remains wide open. It could be a person, it could be persons."
Dr George Velmahos, chief of trauma surgery at Massachusetts General Hospital, said doctors removed dozens of sharp objects from victims.
He said: "There are people that have 10, 20, 30, 40 in their body or more. Some suffered serious burns."