POLICE spent an hour chasing a man acting dangerously around Preston Dock.
Members of public called for help after seeing the man stood on the wrong side of the railings near the marina, at 8.10am on Tuesday.
A short time later, the man climbed back over and ran towards the nearby cinema and Mexican restaurant.
At 8.30am, he was again spotted on the wrong side of the dock railings, and police negotiators were called in.
At 9.05am he ran off towards the restaurant again, and at 9.10am he was arrested.
A police spokesman said there was reason to think the man was intoxicated.