military s m-16 and m-4 assault rifles. army officials locked down the post a couple of days ago. no one in or out allowed during the search. the ammo is still missing. u.s. officials announced this week they had credible yet unconfirmed information that a plot was under way to either either new york or washington or both. let s get right to susan candiotti in new york. susan, you re getting important new details about what or who u.s. officials are looking for? reporter: that s right, fred. we re learning interesting new information about the timing of this possible conspiracy. at least two of the three men involved in this possible terror plot have traveled to the united states last week. of course it remains unconfirmed as does the plot as to whether these people arrived in the united states. the authorities are still working on the assumption that they may have already arrived in the united states. a third man that is believed to be part of this possible group was tra