Police will implement a zero tolerance policy towards violence at a pair of rival protests in Melbourne this weekend, with as many as 500 additional officers called in to keep the peace.

The United Patriots Front - a controversial right-wing anti-Islam group that has staged a number of 'rallies' across Australia over the past year - is due to hold another event at Bridges Reserve in Coburg, Melbourne on Saturday.

At the same time, counter-protest group 'No Room for Racism' is planning its own event that includes a 300 metres march to Bridges Reserve to confront the UPF crowd.

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Police will implement a zero-tolerance policy towards violence at a pair of rival protests in Melbourne this weekend, with more than 500 additional officers called in to keep the peace

Social media invitations suggest more than 300 people could turn out for each protest.

The two groups have clashed repeatedly at protests, with the ugliest scenes being seen in Melbourne last year.

In preparation for the event, police is planning to have up to 500 extra officers in the area and establishing weapons checks near the protests, the Herald Sun reports.

The newspaper also claims the cost of policing protests held since November last year - including the one planned for Saturday - will exceed $1.7 million.

Up to 500 police will attend a United Patriots Front event on Saturday, with clashes expected between the far-right group and a 'No Room for Racism' event that is being held in the same location

Anti-racism protesters are seen marching during an event at Parliament House in Melbourne last year

A Victoria Police spokeswoman could not confirm the number of additional officers, but said there will be a 'strong police presence at the rally in order to maintain public safety'.

'Police will be closely monitoring the rally to ensure there are no breaches of the peace or crimes occurring,' the spokeswoman said.

'Police will also be conducting stringent searches at several check points to ensure no weapons are brought to the rally. Our message is clear; if you bring a weapon you will be caught.'

United Patriots Front supporters (pictured in July 2015) and anti-racism protesters have clashed seven times at rallies since November last year

A Victoria Police spokeswoman said there will be a 'strong police presence at the rally in order to maintain public safety' at the United Patriots Front (pictured) and 'No Room for Racism' protests

Young families and children were also warned not to attend either of the events.

Despite the police warning, online comments made ahead of the rally suggest there will be further ugly scenes on Saturday.

'We despise the socialists, the communists, the Marxists, the anarchists, and all of there far left wing supporters that only want to destroy this great nation', part of a post on the UPF's Facebook page reads.

The two groups have repeatedly clashed at events in Melbourne, including one outside Richmond Town Hall in May 2015 (pictured)

Protesters have also jostled with police at the events, which have required a strong presence to keep under control

'The socialist, anarchist, Marxist Australia-haters of Melbourne will be shown that this is not their city.

'Don't miss your chance to be part of the rally that turns the tide against the traitors that are trying to destroy our nation.'

Other comments on the post mention 'taking our country back', and the group's slogan 'rise without fear'.

'Don't miss your chance to be part of the rally that turns the tide against the traitors that are trying to destroy our nation,' the United Patriots Front (pictured during a rally in May 2015) said ahead of Saturday's event

Police arrest United Patriot supporters during a protest in front of Parliament House in Melbourne between United Patriots and anti racism protesters

Local councillor Sue Bolton, who organised the 'No Room for Racism' rally, shared pictures on Facebook of banners her supporters have made ahead of the march.

Victorian protests held in Melbourne, Richmond, Bendigo and Melton have seen some of the worst confrontations, while events have also been held in Sydney, Perth, Brisbane and other cities around the country.

UPF supporters also made headlines earlier this year by sneaking banners that read 'stop the mosques' into two AFL games - one in Melbourne and one in Perth.

Daily Mail Australia contacted Sue Bolton for comment.

Protesters are seen clashing with police as they surround Parliament House in Melbourne on July 18, 2015