As protests against President-elect Donald Trump swept the nation for the second evening in a row on Thursday, some peaceful rallies turned rowdy.

Following Trump’s presidential win early Wednesday morning, thousands of people have turned out in cities all over the U.S. to protest his election. Cities like Philadelphia, Denver, Dallas, Minneapolis and Oakland, California saw hordes of activists take to the streets in staunch opposition to Trump, a controversial businessman who has been accused of sexual assault, threatened to deport hundreds of thousands of immigrants and proposed banning Muslims from the U.S. 

A anti-Trump march in Portland, Oregon that took place Thursday night soon escalated into what police called a “riot,” as protesters began to vandalize stores and confront police. In a flurry of tweets from the Portland Police, authorities announced that some people in the crowd had turned to violence. Protesters were beginning to brandish baseball bats and began “throwing projectiles at police.”

“Due to extensive criminal and dangerous behavior, protest is now considered a riot. Crowd has been advised,” one tweet read.

More than 25 protesters were arrested in Portland, according to CNN.

In Dallas, police reported they'd arrested at least three people, while in Houston, at least five arrests were made Thursday night, according to ABC News

In California’s Bay Area -- which includes Oakland, San Francisco and Berkeley -- many protests remained peaceful, yet at least 11 demonstrators were arrested after Molotov cocktail explosives were thrown and store windows were smashed, according to police reports.

One police officer told CNN that about 185 protestors were also arrested in Los Angles.

In New York City, many activists gathered around Trump Tower in protest and brandished signs that read “Not My President.”

Though Trump won the majority of electoral college votes, it appears that his rival, Democrat Hillary Clinton, got the popular vote.

On Thursday night, the newly elected Trump took to Twitter to cite the protests as “unfair.”

But then, early Friday morning, Trump seemed to walk back his reaction. He coolly tweeted, “Love the fact that the small groups of protestors last night have passion for our great country. We will all come together and be proud!”