Rep. Peter King, R-N.Y., noted Tuesday that the al Qaeda magazine Inspire gave instructions on how to make the pressure cooker bombs used in the attack on the Boston Marathon Monday.

“My understanding is that those pressure cooker-type bombs were described years ago in Inspire, the al Qaeda magazine,” King, chairman of the House Homeland Security subcommittee, told MSNBC’s Andrea Mitchell, per a rush transcription.

“The two bombs that killed three people and injured at least 176 at the Boston Marathon on Monday were made from six-liter pressure cookers crammed with shards of metal, nails and ball bearings and stashed in black duffel bags, police sources revealed today,” The Daily Mail noted, adding that the pressure cooker bomb is “a preferred weapon of al-Qaeda and listed as the ‘most effective’ weapon of jihad, according to an English-language terror magazine called Inspire.”

President Obama emphasized this morning that intelligence officials haven’t identified the perpetrators. “We do not know whether this was an act of an organization or an individual or individuals,” Obama told reporters. “We don’t have a sense of motive yet. So everything else at this point is speculation. But as we receive more information, as the FBI has more information, as our counterterrorism teams have more information, we will make sure to keep you and the American people posted.”