CONCOURSE, the Bronx (PIX11) — A child suffered severe head trauma in a fall in an elevator shaft on Thursday, officials said.

A 7-year-old boy was found unconscious on top of the elevator on the first floor of a Grand Concourse building, FDNY officials said. Police originally said he was 6-years-old. The boy suffered multiple skull fractures.

Emergency teams had rushed to the building around 12:45 p.m., authorities said. They rushed the child to a hospital in critical condition.

Just after noon, the boy’s 62-year-old grandfather and his home attendant were surprised to find their apartment door unlocked and his grandson gone. He told PIX11 News, in Spanish, that the boy — whose name was given as Matthew Mendoza — escaped “very fast.”

Police said they were able to track the child’s movements in the building using cameras.

The boy had wandered up a staircase to the sixth floor, where he then found his way onto the roof, police said. Once on the roof, the boy entered the room housing the elevator mechanics through a door that should’ve been locked.

In the room, police found the boy’s tiny fingerprints on the dust where he fell through an opening in the floor. It was about a foot wide, just big enough for a child’s body to fall through. The fall caused him to suffer multiple skull fractures after landing on top of the elevator, police said.

The Department of Buildings was notified. Dozens of violations have been issued over building elevator issues dating back to 1992, but most of those have been dismissed, records show.