Pressure-cooker bomb instructions in al-Qaeda magazine

• Magazine tied to killed cleric Anwar al-Awlaki was published online
• Issue contained articles featuring %22open-source%22 methods of terror
• Article advised using round metal objects for shrapnel

Instructions to make bombs out of pressure cookers similar to those believed the source of two explosions in Boston on Monday were published two years ago in Inspire, an online magazine tied to al-Qaeda and the late U.S.-born cleric Anwar al-Awlaki, an analysis of the magazine shows.

The article, "How to Make a Bomb in the Kitchen of Your Mom," by "the AQ Chef" instructed would-be bombers to glue shrapnel to the inside of a pressure cooker and then "fill in the cooker with the inflammable material."

Would-be bombers, the article said, should use gloves to prevent their fingerprints from being found on the bomb fragments and to "put you [sic] faith in Allah and pray for the success of your operation."

The summer 2010 issue of Inspire featured several articles on what it called "the open-source Jihad," which instructed readers on how to make their own terrorist materials.

Awlaki, the magazine's founder, was killed in a U.S. drone strike in Yemen in 2011.