The body of a 400-pound man was found stuffed in a duffel bag inside an apartment in a Bronx housing project Saturday, sources told the Daily News.

Patrol officers responding to a different incident at the Justice Sonia Sotomayor Houses in Soundview caught a whiff of a foul odor coming from another apartment, the sources said.

The cops located a son of the resident, who was not immediately identified, to let them inside the sixth-floor apartment on Bruckner Blvd., sources said.

The door opened to a gruesome scene: blood covered the kitchen floor, cleaning products were strewn about the room and a bloody hatchet was lying nearby, sources said.

Cops also spotted a large duffel bag, drenched in blood, in a kitchen closet, sources said.

“It’s soaked,” a police source said. “It’s a river of blood coming from the bag, at least 8 pints.”

Crime scene detectives and workers from the city’s medical examiner’s office were still working inside the apartment last night.

Although the identity of the body had not yet been determined, many residents were shocked that it could be their heavyset neighbor. [Daily News]