An uneasy calm has descended over Los Angeles after the first night of a curfew lifted on Wednesday, as cities across the US brace for more protests.

In Los Angeles, nearly 400 people have so far been arrested, including 330 undocumented migrants and 157 people arrested for assault and obstruction, including one for the attempted murder of a police officer.

Federal prosecutors have so far charged two men for throwing Molotov cocktails at police officers in two separate incidents.

A total of 4,000 National Guard troops and 700 Marines have been deployed to help quell the unrest.