A man brandished a baseball bat and threatened passengers on a Glasgow train.

The incident happened on a service between Glasgow Queen Street and Helensburgh Central.

A man with a baseball threatened passengers before leaving at Helensburgh shortly after 7.30pm on Friday.

Officers want to trace a man on CCTV who they believe could help them with their enquiries.

He was later seen on a train between Dumbarton Central and Balloch.

The man was last seen walking in the direction of Station Road towards Back Street in Renton.