"(CBS) The person responsible for analyzing the Iraqi weapons threat for Colin Powell says the Secretary of State misinformed Americans during his speech at the U.N. last winter.

Greg Thielmann tells Correspondent Scott Pelley that at the time of Powell’s speech, Iraq didn’t pose an imminent threat to anyone – not even its own neighbors. “…I think my conclusion [about Powell’s speech] now is that it’s probably one of the low points in his long distinguished service to the nation,” says Thielmann. "

Steve Allinson and a dozen other U.N. inspectors in Iraq also watched Powell’s speech. “Various people would laugh at various times [during Powell’s speech] because the information he was presenting was just, you know, didn't mean anything - had no meaning,” says Allinson.

“We were told we were going to the site to look for refrigerated trucks specifically linked to biological agents,” Allinson tells Pelley. “…We found seven or eight [trucks], I think, in total, and they had cobwebs in them. Some samples were taken and nothing was found.”