Joshua Prater, 18, was arrested after a housekeeper found a suspicious device while cleaning Prater's room, police say.
The woman reportedly brought the device to the Tempe (Arizona) Fire Department, which called the city's bomb squad to examine it. The device turned out to be an active improvised explosive device (IED), azfamily.com reports.
"They had it X-rayed, they saw it was a valid IED," Tempe Police Sgt. Mike Pooley said, according to MyFoxPhoenix.com. "It was something that wasn't big, but could cause serious injuries and the death of someone."
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