An activated sprinkler in a third-floor trash chute caused an hour-long evacuation from Thurston Hall but no damage Saturday night.

Students were evacuated at about 8:50 p.m. and told to head to the Marvin Center before being allowed to return to their rooms at about 10:00 p.m.

The cause of the sprinkler activation is unknown, said University spokesman Kurtis Hiatt. It could have been due to heat or it could have been hit inside of the chute, he added.

Student rooms and common spaces did not face any damage, though there was a small amount of water on the third floor and basement trash rooms.