LESSONS FROM THE NEW YORK BOMBING: “That easy availability of bomb-making information is believed to be a factor in the New York and New Jersey events. Authorities have noted that in the Chelsea incidents, the bomb that exploded and the one found unexploded nearby were both pressure-cooker devices, quite similar to the IED used in the Boston Marathon attack in 2013. Manuals for building pressure-cooker bombs have appeared on websites associated with many extremist groups, including ISIS and Al Qaeda. The devices are little more than an ordinary pressure cooker packed with explosives and shrapnel, such as metal screws, and a means of detonating the device remotely. Typical remote detonators are cellphones, garage-door openers, or simply a long pair of twisted wires.”