and despite some initial confusion among american intelligence officials, how serious a threat this has turned out to be. we have extensive coverage and want to begin with our justice correspondent pete williams. pete, good evening. reporter: lester, officials now say both packages that were intercepted overseas before they could get here contained laser printers the same model as this one. and inside both of them, the toner cartridges, the cartridges that normally hold the powdered toner were instead stuffed with a high explosive, a type that s a favorite of terrorists. all this officials say was artfully designed to avoid detection. these pictures taken by police in dubai tell the story, showing what was inside those printer cartridges, the high explosive known as petn. the same substance was in richard reid s shoe bomb and abdulmutallab is accused of concealing it in his underwear on that flight to detroit last christmas day. last january, dateline asked an explosive e