VIDEO: The chief of staff for Detroit City Council President Ken Cockrel Jr. resigned last week after being caught on videotape taking cash amid a widening federal investigation into public corruption in Detroit, the Free Press has learned.

John Clark, who worked for Cockrel for eight years, quit his job Wednesday after federal agents showed Cockrel a videotape of Clark accepting money earlier this year, two sources told the Free Press. One of the sources said Clark received $2,000 on two occasions.

“There are lots of targets” in the investigation, one source said Saturday.

The Free Press first reported Friday night on freep.com that FBI agents had launched a probe in which they have obtained wiretaps and quizzed several people, including asking questions about Councilwoman Monica Conyers. She has not returned calls seeking comment.

Conyers was among the five members who approved the Synagro deal. The others were Sheila Cockrel, Martha Reeves, Barbara-Rose Collins and Alberta Tinsley-Talabi.

Ken Cockrel Jr., Kwame Kenyatta, Brenda Jones and JoAnn Watson voted against the contract.