A 53-year-old man is being assessed in hospital after being tasered by Fremantle police as he rampaged through the front counter area of the local police station with a hammer.

The incident started around 8am on Saturday morning, when the man walked into the Fremantle Police Station customer service area and started hammering the counter area.

According to police, the man became aggressive after being confronted by police, prompting officers to taser and arrest him.

He was taken to hospital for a medical assessment.

The Fremantle Police Station's front counter area has re-opened to the public after remaining closed for several hours.