SAN ANTONIO - A sprinkler system put out a small fire in an apartment building under construction at the Our Lady of the Lake University campus Sunday morning.

The San Antonio Fire Department said the fire started around 11:30 a.m., and firefighters arrived to a smoke-filled room.

An SAFD spokesperson said, while the building was under construction, the sprinkler system was functioning.

The cause of the fire is under investigation, and SAFD said it's not clear yet how much damage was caused.