It's being released now that the explosives that were used in the deadly bombing yesterday at the Boston Marathon were contained in 6-liter pressure cookers which were then hidden in black duffel bags. This comes from a source close to the investigation who shared this information with the Associated Press.

According to the report,

A person briefed on the attack, which left the streets splattered with blood and glass, said the explosives were in 6-liter pressure cookers and placed in black duffel bags that were placed on the ground. The person said the duffel bags contained shards of metal, nails and ball bearings. The person spoke on the condition of anonymity because the investigation was ongoing.

These types of pressure cooker explosives have been used in Afghanistan, India, Nepal and Pakistan, according to a July 2010 joint FBI and Homeland Security intelligence report. One of the three devices used in the May 2010 Times Square attempted bombing was a pressure cooker, the intelligence report said.

"Placed carefully, such devices provide little or no indication of an impending attack," the report said.

The use of pressure cookers is not anything new. Back in July 2011, the Christian Science Monitor reported how Army Pfc. Naser was caught plotting to blow up Ft. Hood and was later tried, convicted and received two life sentences.

A soldier suspected of plotting a bomb and handgun attack against military personnel at Fort Hood, Texas, was using a bombmaking recipe from an Al Qaeda-linked online magazine, according to federal court documents released on Friday.

Army Pfc. Naser Jason Abdo has been charged with possession of an unregistered destructive device and ordered held without bond. At the time of his arrest on Wednesday, law-enforcement officials recovered a handgun, assorted bombmaking materials, and an article entitled, "Make a bomb in the kitchen of your Mom."

According to the FBI affidavit, at the time of his arrest by the Killeen Police Department, Abdo was carrying a backpack. In addition to the bombmaking article, it contained two clocks, two spools of wire, Winchester .40 caliber ammunition, and a Springfield .40 caliber handgun. He was also carrying a composition notebook with a list that included: "red black green wire; 9v bat, Christmas lights; pressure cooker; power drill; 160 gunpowder; gorilla tape; motal epoxy, glue; 1 small box of shotgun shells; cardboard box; gloves."

Police and federal agents later searched his hotel room – No. 230 at America's Best Value Inn and Suites in Killeen. Among items seized: "electric drill; two clocks; six bottles of smokeless gunpowder; five cut shotgun shells; three Springfield ammunition magazines; four razorblades; shotgun pellets; and two pressure cookers."

According to the affidavit, Abdo was questioned by law-enforcement officials shortly after his arrest and confirmed his intention to carry out an attack.

"Abdo admitted that he planned to assemble two bombs in the hotel room using gun powder and shrapnel packed into pressure cookers to detonate inside an unspecified restaurant frequented by soldiers from Fort Hood," the affidavit says.

These types of pressure cooker bombs have been referenced in joint FBI and Homeland Security venture in 2010.

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The online Al-Qaeda "Inspire" magazine also had information on how to build one of these bombs.
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While we don't have a lot of information on the investigation, we do know that the FBI agent in charge in Boston Richard has said, “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."

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