Three people were injured Friday in an explosion at a University of Nevada-Reno dorm room, officials said.

All three injuries were non-life threatening, a Washoe County Sherriff’s Office spokesman told USA TODAY.

All classes were canceled after the explosion, which authorities described as a “major utility incident,” campus police tweeted.

Update: All classes on the main campus are canceled for the remainder of today, Friday, July 5, 2019. — Univ. of Nevada Reno (@unevadareno) July 5, 2019

Officials closed down the surrounding area as police and fire officials worked to address the situation. Individuals were told to stay away from the scene.

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A student on campus told local news station KOLO that he went outside to see what was going on and found the side of one of the dorm apartments gone.

**BREAKING: Crews respond to apparent explosion at University of Nevada, Reno. Officials say 3 injured in stable condition. Cause unknown at this time. https://t.co/F2629y8SPl — Patrick Hussion (@PatrickHussion) July 5, 2019

The building reportedly houses many student athletes, as well as some international students, staying on campus for the summer.