A 6-year-old Atlantic City boy missing throughout the night was located safe Sunday morning in an Atlantic City apartment building’s spare room, following a door-to-door and rooftop search.

Atlantic City police said the boy was found about 9 a.m. in an apartment building in the 3900 block of Ventnor Avenue.

Police had searched that building earlier in the night — the boy has friends there — to no avail.

Authorities might have found the child the first time, but “some information was withheld with regard to possible locations for the child. …The building contained storage areas and spare rooms that were not revealed to police,” according to Atlantic City police report.

When authorities checked again, “the 6-year-old child was located, safe and unharmed, in a spare room that is utilized by many tenants in the building but was not revealed to police earlier in the evening when searching for the child,” the report said.

Police said they are investigating why this information was not disclosed.

The boy and his mother live in a multifamily residence on Dover Avenue, police said.

Police said the boy’s mother had left him in the care of another tenant, who was checking on the sleeping boy periodically through the night.

But when the boy’s mother returned home at 10:30 p.m., the 3-foot-tall, 65-pound boy was gone, police said.

The missing person case was reported to police at 1:35 a.m. The ongoing search included the Atlantic City Fire Department to check roofs of buildings.

Police said the Division of Youth and Family Services and the Atlantic County Prosecutor’s Office Child Abuse Response Team responded to the Public Safety Building for further investigation.

Contact Brian Ianieri:

609-272-7253