Washington ? The homeland security chief on Saturday tore into his own employees for staging a phony news conference at the Federal Emergency Management Agency.

“I think it was one of the dumbest and most inappropriate things I’ve seen since I’ve been in government,” Michael Chertoff said.

“I have made unambiguously clear, in Anglo-Saxon prose, that it is not to ever happen again and there will be appropriate disciplinary action taken against those people who exhibited what I regard as extraordinarily poor judgment,” he added.

Chertoff said he knew nothing about the matter until after it happened and that he “can’t explain why it happened.”

The agency – much maligned for its sluggish response to Hurricane Katrina over two years ago – arranged to have FEMA employees play the part of reporters at the event Tuesday and question Vice Adm. Harvey E. Johnson, the deputy director.