One person was shot and killed in Portland, Oregon, as a large caravan of Donald Trump supporters and Black Lives Matter protesters clashed in the streets, police have said.

A riot was declared again in Portland after protesters marched to a police union building, blocked a road and started fires. Officers are working every night to quell unrest in the US state of Oregon’s largest city.

Wearing bike helmets and yellow T-shirts, America’s mothers are confronting federal agents in combat gear to protect anti-racism protesters in Portland and, soon, other US cities where US president Donald Trump has vowed to crackdown.