KREM TV / Brent Weisberg

Firefighters stand outside the Stephenson East dorm on WSU's campus where small fires were set and students were evacuated for a couple of hours early Monday morning.

PULLMAN, Wash. - WSU police say two students - a 21-year-old and an 18-year-old - will face arson charges in Whitman County Superior Court for a series of fires on campus.

Washington State University police say the two students are suspected of starting nine small fires early Monday on campus in Pullman.

Police say they have no motive for the fire-setting but the two students appeared to be intoxicated.

No one was injured, but a woman who used a fire extinguisher was treated with oxygen.

The first fire was reported at 12:41 a.m. in a trash can outside a dormitory in the Stephenson complex. The next was in a trash can at 1 a.m. in a parking garage by the fine arts museum, followed by a couple of burning juniper bushes outside Abelson Hall.

Firefighters were then notified of a burning bulletin board on the second floor of the Stephenson East tower, Fire Capt. Scott Van Ness said.

"While the crew was en route on foot into that building, they discovered a larger fire in the main entrance lobby," Van Ness said, "so they went in and put that one out while a second crew went in and checked on the east tower."

Investigators also found a small fire in a stairway in the museum parking garage, Pullman police Officer Reuben Harris said.

The Stephenson complex was evacuated, but students were allowed back in around 2:30 a.m.

Pullman Police Sgt. Reuben Harris said he spotted two men running away from one fire and chased and used a stun gun to arrest a 21-year-old man. He identified the second man.