SANTA ROSA, Calif. (KRON) — Firefighters with the Santa Rosa Fire Department contained a structure fire on the sixth floor of a building in downtown Santa Rosa Wednesday morning. Firefighters responded to the fire at 306 Mendocino Avenue at around 9:40 a.m., according to a tweet from SRFD. Firefighters responded after receiving multiple calls for a fire in the building, according to a SRFD media release. The first unit arrived in under five minutes and smoke and water could be seen from the window of the sixth-floor corner unit.

No fire was visible from the exterior of the building. Fire personnel entered the building and found the fire inside apartment 612, the department said. Occupants of the building were either evacuated or ordered to shelter in place, firefighters said. The building’s fire sprinkler system was activated and helped contain the fire to the unit of origin.

No injuries have been reported as a result of the fire. Firefighters are working to remove water from several other units. Video accompanying the tweet shows Santa Rosa FD vehicles with ladders extended outside the exterior of the building on Mendocino at Fifth Street in downtown Santa Rosa.

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The sprinkler system in the apartment where the fire broke out extinguished a small fire on the west side interior wall of the apartment, firefighters said. Two pet rats were rescued from the apartment. The unit where the fire broke out was damaged from fire and water and three additional units on the fifth and sixth floors were damaged by water. All four units were deemed temporarily unsafe for residents to return to. The cause of the fire is under investigation.