Albuquerque police say bottles and rocks were thrown at a Donald Trump rally there Tuesday night, shattering a glass door as tensions between protesters and police escalated.

Despite initial word of gunshots, Albuquerque’s police department said on Twitter that there was “no confirmation” of gunshots.

“There is no confirmation that any gunshots were fired, contrary to reports. Possible damage to Convention Center Windows by pellet gun,” the department tweeted.

Hundreds of protesters critical of Trump’s immigration rhetoric had gathered outside Trump’s event in New Mexico on Tuesday evening, sometimes crossing metal barricades to try to enter the convention center.

Trump has already left the event.

Police reported rocks and bottles being thrown at their police horses, but downplayed their clashes with protesters on Twitter, noting that they hadn’t used tear gas and had not arrested any of the protesters.

“The smoke that has been seen is not tear gas, it’s just smoke. We have not deployed tear gas at this time,” the police tweeted.

Police added: “Only arrests at this point have been from inside the rally.”

It’s not the first instance of violence at a Trump event. In March, there were violent clashes between Trump’s supporters and protesters in Chicago, at an event that Trump decided to cancel.

Protesters inside Trump events have faced violence, too. One was punched at an event in North Carolina, with the Trump supporter involved in the incident later facing criminal charges.