Centennial Elementary School Principal Tyler Hanson says parents are being notified about the incident.

Bismarck police are investigating an incident involving a masked man hiding in trees at an elementary school playground during a noon-hour recess.

Authorities say the man dressed in black and wearing a red ski mask fled on foot Friday after being approached by a school official, scaling a chain-link fence to get away.

Centennial Elementary School Principal Tyler Hanson says parents are being notified about the incident.