A gunman raided the Colorado Supreme Court on Tuesday morning - firing shots, setting fire to the building and holding a security guard at gunpoint, according to local reports. 

It comes after Colorado's justices' 4-3 decision last month that Donald Trump should be barred from the state's primary ballot, citing the constitution's 'insurrection' clause. 

The justices have received death threats in the wake of the decision but Tuesday's incident is being treated as 'not associated' with the case, police said. 

'The CSP [Colorado State Patrol] and DPD [Denver Police Department] are treating this incident seriously, but at this time, it is believed that this is not associated with previous threats to the Colorado Supreme Court Justices,' the Colorado State Patrol said in a statement.

The gunman had reportedly fled the scene of a car wreck at at 13th and Lincoln Streets by the court building in Downtown Denver around 1:15 am local time after reportedly pointing a handgun at another driver. 

The suspect then shot his way through a window on the building's east side and entered the Supreme Court, authorities said. 

He held an unarmed security guard at gunpoint and obtained a key that gave him access to the rest of the building. 

He made his way to the seventh floor, where he fired further shots, and called 911 at 3 am.

The gunman then voluntarily surrendered to police and was taken to hospital to be cleared by medical personnel.   

There were no injuries to other people, police confirmed.

The Denver Fire Department was called to the scene and quickly able to get the fire under control. 

There is significant and extensive damage to the building, according to the Colorado State Patrol.

The suspect's identity has not yet been released.

The state's supreme court hit the headlines in December for their decision to disqualify Trump from the ballot over his alleged role in the January 6 Capitol riot in 2021.  

The court accepted a challenge that argued Trump was ineligible under a 14th Amendment clause that bans those from office who have 'engaged in insurrection.'

This article was originally published by DailyMail.com.