The Department of Education is investigating after a boy with autism went missing from his Brooklyn school.

The mother of 6-year old Abraham Awawda says he was able to walk out of P. 77 K in Borough Park unnoticed Friday.

The special needs school is housed in the same building as P.S. 164.

Asmaa Awawda says school employees did not realize her son was missing until his bus driver asked for him.

"He was gone for more than an hour and was later found inside an apartment building three blocks away," his mother said.

Awawda says she's urging the school to lock its doors, or put alarms on them as an extra precaution.

"I need to know what they're gonna do to make me feel my son's safe in this school, because after what happened, how I'm gonna trust my kids at the school when I thought the school will take care of him more than me and that's the place where he can be safe there for more than eight hours a day," she said.

The DOE released a statement saying the school activated its missing student protocol and followed the proper procedure.