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.
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.