NEW YORK -- Sources tell CBS News that the pressure-cooker device thaton Saturday evening contained residue of a material called Tannerite, a legal explosive made up of ammonium nitrate and aluminum powder.
“It was a very crude, simple device,” Former FBI agent Manny Gomez said. “Put in some metal devices, whether it’s ball bearings, screws, nails, et cetera. It turns into a huge detonation, that obviously could hurt. kill, or maim many people.”
Gomez told CBS News’ Anna Werner the bomb was similar to those used in the.
Experts say terrorists commonly use the crude bombs overseas, but a former FBI bomb specialist told CBS News the use of them has “ramped up substantially” in the U.S.
Directions to make them can be found on the internet.
The devices use hard-to-trace, easily-obtained explosives packed into cheap containers. All that’s required is an electrical trigger, like a cell phone, to set them off.
“In this case it was an old fashion type of flip cell phone that the caller simply calls. It sends an electric shock through the wires, it explodes the pressure cooker,” Gomez said.
Experts say they’ve also seen the use of common Christmas lights as fuses inside homemade devices in other American bombing incidents.