Authorities investigating the Boston Marathon bombing will be closely examining fragments of the detonated devices for “signatures” pointing to any terror group possibly responsible, according to a former Athens-Clarke police forensics technician who processed hundreds of improvised explosive devices overseas.
The pressure-cooker type bombs authorities say were used in Monday’s deadly attack were crude but common methods of attack used by terrorists in Afghanistan, said Todd Sartain, who now investigates IEDs for a military contractor in that war-torn country.