Police were called to the Paddington Ale House, where protesters disrupted an event being hosted by One Nation leader Pauline Hanson.

Senator Hanson, who is in WA as part of a week-long campaign ahead of the State Election on Saturday, was holding a Pizza and Pots event inside the Mount Hawthorn pub for her supporters.

Camera Icon Police prevent protesters from getting inside the hotel. Credit: Seven News.

Police were called and there were reports of punches being thrown outside the hotel. At least one person was led away by police.

Tensions eased when protesters began dispersing about 7pm.

In a statement, police said that “at the height of the demonstration there were 20 police present to ensure the protest was peaceful”.

About 40 people were involved in the protest.

Officers intervened and issued two people with move-on notices.

There were no arrests.

The event, advertised on Facebook, generated political opposition from local residents, as well as controversy after Senator Hanson promised the first 100 guests a free beer.

The venue’s Facebook page was flooded with comments both pro and anti Hanson.

“This sounds like fun! We’re throwing the pots and pizzas at Pauline, right,” one wag queried.

“Oh how low my once favourite pub has sunk,” another lamented.

Play Video Pauline Hanson's decision to offer pints at the Paddington Ale House hasn't gone down well with some punters. The West Australian Video Pauline Hanson's decision to offer pints at the Paddington Ale House hasn't gone down well with some punters.

But there was online support for Senator Hanson, the Paddington and the right to free speech.

“Everything I disagree with must be banned. Petulant little kids jumping up and down about Hanson speaking at the Paddo.

“They're everywhere these little snakes. The Paddo can do as it pleases.”

Earlier in the day, prominent lawyer John Hammond had been reported as saying the gathering had the potential to breach the Electoral Act - if the pizza and beer was seen as an inducement to sway voters.