LA Mayor Karen Bass issued an overnight curfew for about 1 square mile in downtown LA, which has been the site of clashes between police and protesters over the last six days.

Police detained more than 20 people, mostly on curfew violations, on the first night of restrictions in downtown Los Angeles and used crowd-control projectiles to break up hundreds of protesters demonstrating against President Donald Trump’s immigration crackdown,

The mayor said the curfew will run from 8 p.m. to 6 a.m. local time, and cover roughly a square mile of downtown. She said she expects it to last several days.