Later, through interrogations in US custody, Saddam revealed that, immediately prior to the start of the 2003 US invasion, he had announced to his generals that there were no WMD. One theory given currency by Charles Duelfer is that Saddam sent out different signals to different people in order to keep them confused and help stay in power. Documents since captured inside Iraq by coalition forces are reported to reveal Saddam's frustration with weapon inspections. Meeting transcripts record him saying to senior aides: "We don't have anything hidden!" In another, he remarks: "When is this going to end?" And another: "Don't think for a minute that we still have WMD. We have nothing."