Federal agents have descended on a nonprofit organization in New Orleans hired by the city to run a home cleanup program after Hurricane Katrina.

FBI spokeswoman Sheila Thorne says FBI and IRS agents, among others, went to the offices of the New Orleans Affordable Homeowners Corporation on Monday. Some were photographed wheeling boxes from the building.

U.S. Attorney Jim Letten said last week an investigation related to the nonprofit has begun. But he has given no details.

The corporation was hired to run a program to assist low income and elderly hurricane victims. Local media reports have scrutinized ties between its former director and several contractors and questioned whether some of the work it billed to the city was actually performed.