WASHINGTON — The explosive device used by the would-be Detroit bomber contained a widely available — and easily detected — chemical explosive that has a long history of terrorist use, according to government officials and explosive experts.
The chemical — PETN — is small, powerful and appealing to terrorists. The Saudi government said it was used in an assassination attempt on the country's counterterrorism operations chief in August.
It was also a component of the explosive that Richard Reid, the convicted "shoe bomber," used in his 2001 attempt to down an airliner.
PETN was widely used in the plastic explosives terrorists used to blow up airplanes in the 1970s and 1980s.
Investigators say Umar Farouk Abdulmutallab hid an explosive device on his body when he traveled from Amsterdam to Detroit. They say PETN was hidden in a condom or condom-like bag just below his torso.
Abdulmutallab also had a syringe filled with liquid. One law enforcement official said the second part of the explosive concoction used in the Christmas Day scare is still being tested but appears to be a glycol-based liquid explosive. The officials spoke on condition of anonymity because they were not authorized to discuss the investigation.
PETN is the primary ingredient in detonating cords used for industrial explosions and can be collected by scraping the insides of the wire, said James Crippin, a Colorado explosives expert. It's also used in military devices and found in blasting caps. It's the high explosive of choice because it is stable and safe to handle, but it requires a primary explosive to detonate it, he said.
Crippin and law enforcement officials said modern airport screening machines could have detected the chemical. Airport "puffer" machines — the devices that blow air onto a passenger to collect and analyze residues — would probably have detected the powder, as would bomb-sniffing dogs or a hands-on search using a swab.
However, most passengers in airports only go through magnetometers, which detect metal rather than explosives.
Hidden in Abdulmutallab's clothing, the explosive might have also been detected by the full-body imaging scanners now making their way into airports.
But Abdulmutallab did not go through full-body imaging machines in Nigeria or Amsterdam, said Rep. Peter King, R-N.Y. King has been briefed on the investigation.