Fire causes $1m damage at South Australian school

A fire at a South Australian primary school has caused $1 million damage, investigators say.

Four classrooms at Victor Harbour Primary School were destroyed in the blaze at 2am today.

Firefighters stopped it from spreading to neighbouring buildings which had recently been renovated, Nicole Eely from the MFS said.

"Unfortunately the multiple classroom building was completely gutted by the fire, which took about an hour to extinguish," she said.

"The cause, due to the extent of the damage, is currently undetermined and investigators are expected to complete their investigations over coming days."