Portland protesters cause mayhem again, police officer hurt

PORTLAND, Ore. (AP) - Portland's nightly protests turned violent again even after the city's mayor pleaded for demonstrators to stay off the streets and a police officer hit by a rock early Friday suffered what was described as a serious injury.

The protesters who came out Thursday night clashed with officers near a police precinct station and also used metal bars to disable police vehicles, police said in a statement.

The nightly clashes this week have ratcheted up tensions in the city after an agreement was reached last week between state and federal officials for federal agents to pull back...