PORTLAND, Ore. (AP) — Officials say protesters in Portland, Oregon repeatedly set fire to a police union headquarters building and were repelled by officers spraying tear gas. Twenty three people were arrested amid the clashes that lasted into Tuesday morning. Police say in a statement that the protesters in a group of about 300 people hurled rocks and bottles at officers and set three fires to the sides of the building and one to an awning. All were put out late Monday night and early Tuesday morning. Portland has been gripped by nightly protests for months since the police killing of George Floyd in Minneapolis.