A Brooklyn mom claims a city school let a stranger walk off with her kids.

The scary episode happened at Brownsville’s PS 189, Rhonda Williams Lee says in a Brooklyn Supreme Court lawsuit she filed last week.

Her son and daughter, identified by the initials RL and TL, typically go to an after-school program. But on Feb. 7 Williams Lee told the school the kids would be taking the bus instead.

But a worker let the kids leave with “an unknown adult male,” who led them by the hand towards his home, the mom charges in court papers. The kids finally fled his grasp.

The city said it will review the case. A DOE spokeswoman said there are “protocols for proper dismissal of students.”