By CBSLA Staff

VENTURA (CBSLA) — A suspicious fire has caused major damage to Mound Elementary School in Ventura.

(credit: Ventura Fire Department)

Firefighters called out to the school, 455 S. Hill Rd., at about 2:40 a.m. Thursday found a classroom in the back of the school engulfed in flames. There was an immediate effort protect neighboring classrooms, while fighting the flames, Ventura fire officials said.

READ MORE: Cal State University Will Require Faculty, Staff, Students On Campuses To Be Vaccinated Against COVID-19

The flames were kept to the classroom of origin, but two others suffered heavy smoke damage, authorities said. Firefighters fully extinguished the fire 40 minutes after the initial 911 call, according to the Ventura Fire Department.

READ MORE: Hiking Groups Emerge As Way For Angelenos To Combat Pandemic-Caused Loneliness

The cause of the fire is under investigation, and may be suspicious in nature.

MORE NEWS: UCLA Study: Expiration Of Eviction Moratoriums Led To Further Spread Of COVID-19

No injuries were reported, and a damage estimate was not released.