Police termed the protest a riot and told people who had not returned to the designated square where the protest took place that they would be under arrest.
About 4,000 protesters were in the streets with chants like "we reject the president-elect."
Meanwhile in Colorado, anti-Trump protesters managed to shut down Interstate 25 near downtown Denver briefly Thursday night.
A crowd of several hundred had been marching through downtown Denver earlier in the evening waving anti-Trump signs before taking to the freeway.
Anti-Trump rioting erupts in Portland
11 November 2016
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Police in Portland Oregon have detained several people as an anti-Trump protest-turned violent with demonstrators breaking windows of businesses and starting a dumpster fire downtown.
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