WASHINGTON - The head of the General Services Administration resigned from her post Monday, and two other officials were fired amid an investigation into excessive spending at a 2010 training conference that featured a clown, a comedian and mindreader, Federal News Radio reports.

Martha Johnson, the GSA administrator, submitted her resignation on Monday, citing a "significant mis-step" at the agency to the tune of more than $800,000. Robert Peck, the commissioner of the Public Buildings Service, and Stephen Leeds, Johnson's senior counselor, also resigned.

This story was first reported by The Washington Post.