BEAVERTON, Ore. (AP) — Classes at a high school in Beaverton, Oregon, will be cancelled Tuesday following a weekend fire.

KOIN reports that investigators concluded on Sunday that the “failure of a small refrigerator” in one of the Beaverton High School classrooms started the fire around 10:30 a.m. Saturday. The fire has now been classified as accidental, said Tualatin Valley Fire and Rescue.

A final estimate on the damage the fire caused has not been released.

After originally saying that school would have a two-hour delay on Tuesday, the Beaverton School District said that classes are canceled for Tuesday.