FRESNO, California. (KSEE/KGPE) – Firefighters worked to contain a fire that broke out inside a historic high-rise building in downtown Fresno on Sunday.

Around 4:00 p.m., the Fresno Fire Department says a fire engine responded to the Pacific Southwest Building near Fulton and Mariposa avenues after receiving a report that a sprinkler system was going off on the 14th floor.

When firefighters arrived, they found an alarm sounding inside of the building as residents made their way safely outside.

Firefighters made their way up to the 14th floor, where they called for a 2nd-Alarm after finding smoke.

After a 2nd-Alarm was called, several more fire engines arrived and could be seen surrounding the 16-story building.

The sprinkler system was able to keep the fire under control until firefighters could arrive and put it out.

Fire officials say investigators are working to figure out what started the fire.