Police in riot gear used smoke grenades on hundreds of protesters who they said hurled rocks and bottles outside a Donald Trump campaign rally in Albuquerque, New Mexico, on Tuesday night.

Watch: Protesters throw rocks at police, officers respond by tossing smoke canisters, using pepper spray. pic.twitter.com/BEpSXb1XSh — Jacob Rascon (@Jacobnbc) May 25, 2016

Anti-Trump protesters targeted officers on foot and on horseback outside the Albuquerque Convention Center, where Trump was speaking, police said. The Albuquerque Journal reported flaming objects were thrown at some officers.

Protesters also lit Trump campaign merchandise on fire, KOB4’s Caleb James reported.

About 100 protesters broke through barricades and approached the convention center as Trump took the stage, the Albuquerque Journal reported. None entered the building. Windows in the building were broken by what the newspaper said it believed to be pellet guns.

There is broken glass and a heavy police presence at the Albuquerque Convention Center following #Trump rally. pic.twitter.com/zGBPBWxYzF — Sarah McCammon NPR (@sarahmccammon) May 25, 2016

Later, as 4,000 people who were inside listening to Trump departed from the rally, altercations broke out with anti-Trump protesters.

Punches connect as fight breaks out between man in mask and Trump protester. Officer escort masked man away. pic.twitter.com/cnOfeqDgXs — Dan McKay (@mckaydan) May 25, 2016

There were no immediate reports of injuries. Police made arrests inside and outside of the convention center, Reuters reported.

Protesters later moved from the convention center to the streets of downtown Albuquerque.

Here's video of anti-Trump protesters walking on and jumping on police cars in Albuquerque pic.twitter.com/Ekk2f9pvdF — Oliver Darcy (@oliverdarcy) May 25, 2016

Many of Trump's rallies have been accompanied by violence among supporters and detractors. Trump, who at times has encouraged violence, has been condemned for not doing more to disavow the hostilities.

Earlier in the day, former President Bill Clinton was at the Plaza de Española to campaign for his wife, Hillary Clinton.

Update: May 25 -- Trump tweeted about the protests on Wednesday morning, blaming them on "thugs who were flying the Mexican flag."

The protesters in New Mexico were thugs who were flying the Mexican flag. The rally inside was big and beautiful, but outside, criminals! — Donald J. Trump (@realDonaldTrump) May 25, 2016

Editor's note: Donald Trump regularly incites political violence and is a serial liar, rampant xenophobe, racist, misogynist and birther who has repeatedly pledged to ban all Muslims -- 1.6 billion members of an entire religion -- from entering the U.S.