At least two classrooms were badly damaged in a fire at Sacred Heart Girl's College in Hamilton overnight.

A police spokeswoman confirmed this morning the fire is being treated as suspicious. Detectives will be at the scene today.

A staff room, classroom and resource rooms at Sacred Heart Girls' College were damaged by fire on Friday night. Photo / Natalie Akoorie
A staff room, classroom and resource rooms at Sacred Heart Girls' College were damaged by fire on Friday night. Photo / Natalie Akoorie

The fire began just before midnight and a number of people saw it and called 111.

It took 40 firefighters five hours to put the flames out.

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Fire and Emergency shift manager Paul Redden said the top floor of a two-storey block was well alight when trucks arrived.

A fire investigator is also at the school this morning.

A staff room, classroom and resource rooms at Sacred Heart Girls' College were damaged by fire on Friday night. Photo / Natalie Akoorie
A staff room, classroom and resource rooms at Sacred Heart Girls' College were damaged by fire on Friday night. Photo / Natalie Akoorie