The Berkeley Police Department arrested 10 people for various violations, including fighting, as tension grows between demonstrators protesting hate groups and supporters of US President Donald Trump on Sunday afternoon, The Los Angeles Times reported.

The mostly peaceful demonstration started heating up about noon at Martin Luther King Park, where the two rival groups faced off and several fights broke out.

Police in riot gear fired a rubber bullet at one demonstrator who attempted to cross a barricade into the park, which was closed to the public, but later opened.

Some protesters set off purple smoke bombs.