Anti-Trump protests continue in American cities

Protests have been held for a second night in several U.S. cities after the election of Donald Trump as president. According to media reports, the protests were mostly attended by young people saying a Trump presidency would create deep divisions along racial and gender lines.

Rallies heated up in Portland, Oregon, where police publicly declared protests to be a "riot" due to "extensive criminal and dangerous behavior," according to a tweet on the police department's Twitter page.

"Crowd has been advised," the tweet added without elaboration.

Police tweeted that projectiles had been thrown at officers, and cars had been damaged.

Protests continued in other US cities including Los Angeles, Philadelphia, Denver, Minneapolis and Oakland, California.

On Twitter, Trump called the demonstrations that first developed on Wednesday "very unfair."

A small crowd also gathered outside Trump Tower in Chicago, a day after thousands marched through the city centre. Some passers-by cheered them but at least one driver shouted that they should "shut up and accept democracy", the Associated Press news agency reported.

Meanwhile Mexico's president said he was optimistic his country could have a positive relationship with the US under Trump, despite his anti-Mexican rhetoric during the campaign.

Enrique Pena Nieto said he and Trump had agreed to meet, possibly during the transition period before Trump's inauguration in January.