DENVER (CBS4) – A man who damaged 10 pieces of art in the Denver Art Museum is an 18-year-old, according to authorities. It happened Sunday afternoon in the Hamilton wing and Jake Siebenlist is under arrest on criminal mischief charges.

(credit: CBS)

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“It’s hard for us to understand why this happened,” museum director Christoph Heinrich said.

Denver police said Siebenlist was arrested after apparently paying admission at approximately 1:45 p.m. then going into the Frederic C. Hamilton Building and causing the damage. Museum staff then alerted police.

(credit: CBS)

The museum is assessing the damage at this point. Heinrich said a variety of different types of artwork was damaged.

“It was objects mostly from the pre-Columbian collection, modern and contemporary and one object from the Asian collection,” Heinrich said. “The pre-Columbian objects were ceramic vessels and the Chinese object was a 19th century vase.”

Heinrich said there was nothing accidental about how the vandalism was done.

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“There was a lot of force involved. It was obviously a very angry young man.”

When CBS4 asked on Sunday if the person believed responsible had a weapon or tools of any kind, a spokesperson for the museum said he did not. It appears no other people were involved in any way with the incident.

(credit: CBS)

One gallery of the museum remains closed following the incident but the rest of the museum is open.

Siebenlist was scheduled to appear before a Denver judge on Monday afternoon.

“We don’t know anything about the motivation. It’s clearly something police are investigating,” Heinrich said.

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Heinrich said it’s the first time someone has damaged art inside the museum on purpose.