teams are now looking at that bomb. >> we in the bureau are currently exploiting an ied improvised explosive device seized overseas which is similar to the devices used by aqap in the past. >> of course, investigators have said there is still concern that there could be more of these same underwear bombs still out there. catherine marriage with the news live in washington tonight. and the reason for concern there is that investigators now say there is no doubt that this bomb could have brought down or would have brought down a plane. >> that's right, shep. u.s. officials say the streamline device so-called brief bomb relied on the chemical which is seen as a more reliable detonator. al qaeda used the same material for the ton nature in printer cartridge bombs that nearly succeeding in bringing down cargo jets in 2010. alarm function acting a timers. we're told the mole was low level al qaeda operative inside custody who volunteered for the mission. he first left saudi without a passport and spent time in