Donald Trump's campaign office in Denver was vandalized twice in the same day.

Police responded to the office at Clarkson Street and 18th Avenue shortly before 9pm on Friday after a rock was thrown through a window.

Michael Ferrara, 33, was taken into custody on suspicion of criminal mischief, CBS Denver reports.

Ferrara was reportedly detained at the scene by a security guard with Trump's campaign until officers arrived.

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A rock was thrown through the window of Donald Trump's campaign office in Denver on Friday. Above, the window after the incident

Around two dozen volunteers and campaign staff were inside at the time, but no one was hurt, according to the local station.

The incident came hours after the building was vandalized with graffiti that included the words 'pervert' and 'a**wipe'.

The insults were painted on the office's facade in the early hours of Friday morning.

No suspects have been identified or located in that incident.

In the early hours of Friday morning, someone painted graffiti on the campaign office building

It comes after a GOP office in Hillsborough, North Carolina, was firebombed last month.

Michael Ferrara (pictured) was taken into custody on suspicion of criminal mischief for the rock throwing incident

Trump held a rally in Denver on Saturday night, shortly after he was rushed off stage at an event in Reno, Nevada, over fears a protester had a gun.

No weapon was involved in the commotion that briefly disrupted the rally.

In a statement the Secret Service said a person in front of the stage had shouted 'Gun!' but no firearm was found on the person or in the immediate area.

Despite this, Trump's son, Donald Jr., and Dan Scavino, who runs Trump's social media operation, re-tweeted a message that read: 'Hillary ran away from rain today. Trump is back on stage minutes after assassination attempt.'

At the Denver rally, a pastor, introduced as Father Andre Y-Sebastian Mahanna, falsely called the Reno incident 'an attempt of murder against Mr. Trump.'