LEWISBURG — No one was injured, but a dormitory room fire displaced one Bucknell University student and forced 152 other occupants of Harris Hall to flee the building at 4 a.m. Monday.

Some of the students sought shelter next door at Larison Hall, and others waited outside for an hour before they were allowed back into their rooms, said Bucknell spokesman Tom Evelyn, director of media relations.

The fire was quickly extinguished by the building’s sprinkler system, he said, and was out before firefighters arrived. Three fire companies responded: Lewisburg, Milton and Mifflinburg. The first truck arrived at 4:16.

Evelyn said the damage was confined to the one room and mostly was caused by smoke and water.

The displaced student, who was not identified, was provided with alternative housing. The damaged room was occupied by only one student.

The cause of the fire is under investigation, he said.

Smoking is prohibited in all dorm rooms. If a student broke a rule, like the smoking prohibition, he or she might have to pay for the damages, Evelyn said.

Damage estimates were not available Monday.