PHILADELPHIA —  A former city treasurer, a powerful city lawyer and 10 others were indicted Tuesday in a municipal corruption investigation that became public when a bugging device was discovered in the mayor's office.

The indictment alleges that in 2002 and 2003, attorney Ronald A. White made payments to then-Treasurer Corey Kemp (search) to influence which financial services companies were selected to handle bond transactions for the city.

Two Commerce Bank-Pennsylvania (search) officials were also charged with making improper loans to Kemp.

The probe became public in October, when police conducting a security sweep discovered an FBI listening device in the City Hall office of Mayor John F. Street (search). Street has not been charged with any wrongdoing.