Denver police on Saturday afternoon identified the suspect they arrested after a rock was thrown through a window at presidential candidate Donald Trump’s campaign office.

Michael Ferrara, 33, is being held for a potential charge of felony criminal mischief, Denver Police Department spokesman Tyrone Campbell said. He has a hearing set for Sunday morning in Denver County Court, and Campbell said police plan to present the case to the district attorney’s office for potential charges next week.

The incident was the second act of vandalism in 24 hours at the Republican candidate’s outpost at 18th Avenue and Clarkson Street in Uptown. As Tuesday’s election approaches, political tensions are running high and have spurred at least one other act of anti-Trump vandalism in North Carolina.

#DPD has 1 person in custody in relation to the reported Criminal Mischief case in the 700 Blk of 18th Ave. Michael Ferrara; DOB 07/08/1983. pic.twitter.com/ItLbFnZUr4 — Denver Police Dept. (@DenverPolice) November 5, 2016

In Denver, the rock crashed through a set of two windows that were about three feet apart just after 8 p.m. Friday while staffers and volunteers were inside making phone calls.

It narrowly missed a young boy who was volunteering with a parent, said Patrick Davis, a senior adviser to Trump’s Colorado campaign.

“He was sitting near the window, and the rock came close to hitting him,” Davis said Saturday. “He was pretty shaken up. People inside the building said it sounded like a gunshot. They hit the floor.”

Rock thrown through window at trump headquarters in Denver #9NEWS pic.twitter.com/34uzShgni5 — Chris Cheline (@ChrisCheline) November 5, 2016

A security guard who works for the campaign grabbed the suspect and held him until police arrived.

“It’s still under investigation,” Campbell said. “Obviously we’re going to investigate everything we can in the case,” including probing for any possible links between the two most recent incidents of vandalism to hit the office.

Earlier Friday, campaign staffers arrived in the morning to find defaced windows and graffiti on a brick wall that included foul language and called the Republican nominee a “thief” and “pervert” in big, block letters.

In another previous incident, the same office was tagged during a protest on the night of a presidential debate, Davis said.

Another incident in North Carolina this week targeted the Alamance County Republican Party headquarters, with anti-Trump messages spray-painted on the building.

“This is important stuff,” Davis said of the election, “but it’s not worth going to jail over it.”