Authorities said a supporter of Donald Trump was arrested after spraying bear repellent on a small crowd protesting the president at the Santa Monica Pier.
Santa Monica police said pro- and anti-Trump demonstrators were shouting at each other Saturday when a scuffle broke out.
A video posted online shows a man wearing a "Make America Great Again" hat circling the crowd and then unleashing a torrent of spray from a canister. Officials say nobody was seriously hurt by the repellent, which is similar to pepper sprays used by police.
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The Los Angeles Times reported authorities arrested an unnamed man who could face charges including violating the terms of his parole from a previous weapons violation.
Investigators are trying to determine whether a second man also sprayed the crowd.