NEW ORLEANS — Former New Orleans Mayor Ray Nagin was indicted Friday on charges that he used his office for personal gain, accepting payoffs, free trips and gratuities from contractors while the city was struggling to recover from the devastation of Hurricane Katrina.

The charges against Nagin are the outgrowth of a City Hall corruption investigation that already has resulted in guilty pleas by two former city officials and two businessmen and a prison sentence for a former city vendor.

The federal indictment accuses Nagin of accepting more than $160,000 in bribes and truckloads of free granite for his family business in exchange for promoting the interests of a businessman who secured millions of dollars in city contract work after the 2005 hurricane. The businessman, Frank Fradella, pleaded guilty in June to conspiracy to commit bribery and has been cooperating with federal authorities.

Nagin, 56, also is charged with accepting at least $60,000 in payoffs from another businessman, Rodney Williams, for his help in securing city contracts for architectural, engineering and management services work. Williams, who was president of Three Fold Consultants LLC, pleaded guilty Dec. 5 to a conspiracy charge.

The indictment also accuses Nagin, who now lives in Frisco, Texas, of getting free private jet and limousine services to New York from an unidentified businessman who owns a New Orleans movie theater. Nagin is accused of agreeing to waive tax penalties that the businessman owed to the city on a delinquent tax bill in 2006.

From several city contractors, Nagin is accused of accepting free travel and vacation expenses for trips to Hawaii, Chicago, Las Vegas and Jamaica while in office.