Supporters and opponents of Republican presidential nominee Donald Trump have clashed in the city of San Diego in California.
Police declared a gathering outside the city's convention centre unlawful and made 12 arrests, as stones and water bottles were thrown.
Mr Trump was in the city near the Mexican border to hold a rally ahead of the 7 June California primary.
He has pledged to build a border wall to keep out illegal immigrants.
The skirmishes flared as the convention centre emptied following Mr Trump's rally, and supporters and opponents met in the streets, jeering and heckling each other
Dozens of police officers in riot gear had been deployed to separate them.
Some protesters scaled a wall of the centre to throw water bottles at police.
After ordering the crowds to disperse, police then moved them away from the city's Gaslamp Quarter.