A local TV News station apparently condradicts White House claims that the weapons were stolen prior to the arrival of US forces. In April 18, a local news station followed US forces to Al-Quaqaa and filmed them observing huge quantities of explosives. Then notices that the soldiers did not do such a great job locking them up once they left.
http://kstp.dayport.com/viewer/viewerpage.php?Art_ID=159660/