Demonstrations outside a Donald Trump rally turned violent of Tuesday night, with protesters throwing burning clothing and other items at police officers and knocking over bins and barricades.
Pepper spray and smoke grenades were used on what police later labelled a "riot" outside the Albuquerque Convention Centre in New Mexico, the Associated Press reported.
During the rally, one woman was physically dragged from the stands by security. Other protesters scuffled with security as they resisted removal from the convention centre, which was packed with thousands of cheering Trump supporters.
Many protesters held up banners, shouted and did their best to resist removal.
The presumptive Republican presidential nominee responded by telling them to "go home to mummy" and instructing security personnel to remove them.
He asked of one demonstrator, “how old is this kid?”, before providing his own own answer: "Still wearing diapers."
Trump's supporters responded with chants of "Build that wall!"
The altercations left glass at the entrance of the convention center smashed.
During the rally, protesters outside overran barricades and clashed with police in riot gear. They also burned T-shirts and other items labeled with Trump's catchphrase, "Make America Great Again."
Albuquerque attorney Doug Antoon said rocks were flying through the convention centre windows as he was leaving Tuesday night. Glass was breaking and landing near his feet.
"This was not a protest, this was a riot. These are hate groups," he said of the demonstrators.
Albuquerque police said several officers were treated for injuries after getting hit by rocks thrown by protesters. At least one person was arrested from the riot, police said.
Karla Molinar, a University of New Mexico student, said she participated in disrupting Trump's speech because she felt he was attacking members of her family who are living in the country illegally. She said she believes Trump is using them as scapegoats for the nation's problems.