NEW YORK (PIX11) – FBI investigators believe they have found the remains of a pressure cooker and another metal container that exploded Monday during the Boston Marathon, killing three and wounding 176 people.
Investigators also found a shredded, black nylon backpack which the pressure cooker bomb was likely inside of when it was placed near the crowded marathon route, according to a joint FBI and Homeland Security report.
Another metal container that is believed to have exploded 10-15 seconds later, was found with the tattered remains of a second backpack less than a block away.
The explosive used is still not known, pending a chemical analysis. Both containers were packed with an improvised collection of shrapnel — “possibly including nails, BBs, and ball bearings.”
Bombs made from pressure cookers were also used in the failed May 2010 attack in Times Square, and are “extremely common in Southwest Asia and have been used in a number of high profile bombings in India, Pakistan and Afghanistan.” How-to guides for making pressure cooker bombs are easily accessible on various Internet sites and in extremist publications, such as “Inspire”, the al-Qaeda publication.
The FBI and the DOHS also provided the following tips for identifying a possible pressure cooker bomb by the following signs:
— (U) Protruding wires or fuses;
— (U) Unusual smells such as chemical odors;
— (U) Wetness or unusual stains on a container; and
— (U) Apparent abandonment of a pressure cooker in a high traffic, unusual, or otherwise strategic location.