Second night of anti-Trump protests in US cities
Protests have been held for a second night in several US cities after the election of Donald Trump as president - but with smaller crowds.
They were mainly young people saying a Trump presidency would create deep divisions along racial and gender lines.
However police in Portland said they were dealing with vandalism and aggressive behaviour.
In response, Mr Trump tweeted that the protests were "very unfair".
Earlier, he met President Barack Obama at the White House and described him as a good man.
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However a BBC correspondent says that despite their cordiality, Mr Trump is intent on dismantling much of President Obama's legacy. That includes Obamacare, the act extending medical insurance to more Americans than ever before.
Crowds of protesters gathered in cities across the US on Thursday evening.
Police in Portland, Oregon said the protest there should be considered a riot, with shop windows being broken, some demonstrators carrying bats and others arming themselves with rocks.
There were no reports of violence at the other protests, although demonstrators in Minneapolis briefly blocked an interstate highway in both directions.
In Philadelphia crowds gathered near City Hall holding placards bearing slogans such as "Not Our President", "Trans Against Trump" and "Make America Safe For All".
In Baltimore, police said a peaceful crowd of 600 people marched through the city, blocking traffic. In San Francisco high school students waved rainbow banners and Mexican flags.