31.   But they have not yet determined if the blast was ignited by a mechanical failure or an explosive device.

32.   But when the metal was examined under a microscope, experts could not confirm that the damage was caused by an explosive device, further frustrating investigators.

33.   But while the former enemies have already begun to exchange maps marking mines, thousands of explosive devices are still unaccounted for.

34.   But this time, only small explosive devices were discovered on the train tracks and highways and were detonated harmlessly.

35.   Cirincione at the Carnegie Endowment said one of the most dangerous possibilities is that bin Laden could acquire a nuclear explosive device or nuclear materials for contamination.

36.   Current thinking is that such a doomsday rock could be diverted by a huge explosive device, delivered by a rocket.

37.   Conspiracy to unlawfully manufacture explosive devices.

38.   Develop an entry point screening system with integrated sensor technology to detect improvised explosive devices ... and chemical and radiological weapons.

39.   Early Sunday, three Palestinians, who Israelis said were attempting to plant an explosive device near the Netzarim checkpoint, were slain by Israeli troops.

40.   Experts said the technology to produce such a devastating explosive device is easily available.