An apparently serially bludgeoned Manhattan boy was found dead inside a Harlem apartment Saturday, authorities said.

The 10-year-old had “severe trauma” throughout his body, with injuries both old and new, said a source, who added that two family members were being questioned in connection with the child’s death.

The tragic youngster was found just before 2:30 p.m. inside a fourth floor apartment at 260 West 131st St., in the Saint Nicholas Houses, and pronounced dead at Harlem Hospital.

The city Medical Examiner is expected to determine the cause of death. No arrests have been made.