"If you're going to have a fire, this was a best-case scenario," said Ken Meuller, head of maintanance for the Riverside Unified School District.
He was talking about a fire that broke out inside a classroom at Mark Twain Elementary School early Wednesday morning.
Firefighters responded to an alarm after 1 a.m. to find smoke coming from a classroom. They were able to put the fire out within 30 minutes, but not after flames destroyed Classroom No. 405.
Arson investigators will help determine the official cause, initial investigations point to an electrical issue in an air duct.
Firefighters credit the alarm and sprinkler system with helping to keep the fire contained to the one classroom. A few other classrooms did suffer minor water damage.
Mark Twain Elementary first opened for the 2006-2007 school year. It's one of the newest school buildings in the RUSD.