Policeandbomb disposalexpertsrushed tothe scenefoundaredplastic bagunder Beizuo. Experts and police carefullyopenthebag, there is also a box wrappedin several layers of newspaper.
Plenty of warning signs also preceded Nigerian Umar Farouq Abdulmutallab's attempt to blow up Northwest flight 253 over Detroit on Christmas Day 2009 with an underwear bomb made with PETN, a plastic explosive that was not detected by airport security.
At the Bridgeport residence where authorities say he lived most recently, agents with the FBI and local police, including members of a bomb squad, conducted a search, and investigators removed filled plastic bags.