BERKELEY (CBS SF) — Police in Berkeley are asking people to be cautious when visiting Codornices Park after they received several reports of a teenage boy initiating sexual conversations with children.

Since May, police have received four reports of incidents at the park, during which the teen allegedly approached boys from 5 to 9 years old and started “sexual-related conversations,” police said.

READ MORE: SF Restaurant Apologizes for Denying Service to Armed, On-Duty Police Officers

The teen is described as white, between the ages of 12 and 18, 5 feet 6 inches to 5 feet 10 inches tall, with a thin build, blond/brown hair and braces on his teeth.

He has been seen on a blue or green bicycle and wearing a light-colored helmet, according to police.

READ MORE: International Travelers Brace For New COVID Testing Requirement

Berkley police are urging people to talk to their children about the dangers of talking to strangers, to make sure children are supervised while in the park and to immediately report any suspicious activity.

Anyone with information about the teen is asked to call the Berkeley Police Department’s Youth Services Unit at (510) 981-5715.

MORE NEWS: Northbound San Tomas Expressway in Santa Clara Closed by 'Major Injury' Accident

© Copyright 2019 CBS Broadcasting Inc. and Bay City News Service. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.