An explosion at the Oregon State University campus in Corvallis sent a 22-year-old man to the hospital with serious injuries Monday afternoon.

Corvallis Police Department, which responded to the explosion, said the injured man was not a student and was from Cottage Grove. He was taken to Good Samaritan Regional Medical Center.

The explosion was reported around 2:30 p.m. at McNary Field, a park on the east side of OSU campus.

According to police dispatch reports, the incident was the result of a butane tank explosion. Critical injuries to the man's arm and head were reported.

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Police said shortly after the explosion that there was no risk to the public.

Hours after the explosion, 10 individuals, some wearing Mary's Peak Search and Rescue logos, were sweeping the area of the explosion. A blue backpack and a gallon of water were on the grass, among other scattered items.

"CPD and partner agencies deployed an aerial drone and a bomb-sniffing dog to ensure that the site was safe," Corvallis police officials said in a statement. "Portions of McNary Park will be closed to the public as CPD works through its investigation. Please avoid the park if at all possible."

Around 2:57 p.m. Monday, the university sent out an alert telling people to avoid the explosion area and to call 911 if injured. Minutes later, the school announced there was no threat to the community.

"There are no impacts to classes or activities on campus," OSU officials said in a statement.

The explosion and police response left some students and teachers temporarily unable to access their parked cars.

Some assumed rumors of an explosion were a prank like earlier this month. Last week, an 18-year-old student was arrested after being suspected of threatening to place a bomb in a robot that delivers food orders on campus. The student involved later said it was a prank.

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The Register-Guard reporters Haleigh Kochanski and Miranda Cyr and Statesman Journal reporter Dianne Lugo contributed.

Whitney Woodworth is a reporter for the Statesman Journal. For questions, comments and news tips, email wmwoodworth@statesmanjournal.com or follow on Twitter @wmwoodworth.

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