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Al-Qaeda bombs too sophisticated for X-rays
Counterterrorism officials warned that al-Qaeda has exposed a blind spot in aviation security by successfully smuggling bombs on to cargo planes.
PETN
US tightens security, seeks source of parcel bombs
The United States searched on Saturday for the culprits behind a plot to bomb Jewish targets in Chicago.
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PETN: Hard to detect and 100g can destroy a car
The explosive that nearly brought down Northwest Airlines flight 253 is powerful, allowing terrorists to use only small quantities to cause damage.