SAN MATEO (CBS SF) — Police are asking for help identifying a suspect who allegedly touched a 17-year-old girl inappropriately on Tuesday in San Mateo, police said Friday.

A male suspect who appears to be in his 50s boarded a San Mateo County Transit bus at 11:20 a.m. at the corner of South B Street and First Avenue.

The suspect sat down next to the girl and tried to start a conversation. He allegedly put his arm around her multiple times and touched her face, according to police.

The girl told him to stop repeatedly.

The man also allegedly tried unsuccessfully to place his hand under her shirt and once asked her for a kiss, police said.

The man got off the bus in the first block of West Hillsdale Boulevard, near the Hillsdale Shopping Center, a few minutes later.

Police are describing the man as a heavy-set Hispanic or Filipino man with gray hair and medium to dark skin.

He had freckles, wore glasses and had not shaved, according to police. The girl said the man seemed disoriented and may have been having issues with his thinking ability.

SamTrans officials are reminding passengers to notify the bus driver immediately if passengers notice anything aboard a bus that is suspicious or possibly dangerous.

Police are asking parents and guardians to tell their children what is and is not appropriate touching.

Anyone with information about the case is being asked to call Detective Mike Nguyen at (650) 522-7650 or the Police Department’s secret witness line at (650) 522-7676.

© Copyright 2016 by CBS San Francisco and Bay City News Service. All rights reserved. This material may not be published, broadcast, rewritten or redistributed