DETROIT (AP) — Federal prosecutors in Detroit say they’ve filed new corruption charges against imprisoned ex-Mayor Kwame Kilpatrick and also are charging his father, Bernard Kilpatrick.

U.S. Attorney Barbara McQuade and FBI Detroit chief Andrew Arena called a news conference Wednesday afternoon to detail the charges.

In a statement, the government says it also is charging longtime Kwame Kilpatrick associate Bobby Ferguson, ex-city water director Victor Mercado and ex-mayoral aide Derrick Miller.

Kilpatrick resigned as mayor in 2008 after pleading guilty to obstruction of justice in state court. He’s now in prison for violating probation in that case.

He’s also awaiting trial on tax and fraud charges related to how he spent money from a nonprofit fund.

The new 38-count indictment says Kilpatrick and the others used his office to extort contractors.

Copyright 2010 The Associated Press.