A school in West Sussex has been targeted by arsonists for the second time in three months.
The school was damaged on two floors in a fire last December
Firefighters were called to the St Philip Howard Catholic School in Elm Grove, Barnham, on Tuesday morning, before pupils arrived for lessons.
The fire was contained to a first floor classroom and extinguished within 10 minutes. Early investigations indicate it was started deliberately.
It was in the same block that was badly damaged in a fire last December.
West Sussex Fire and Rescue Service said two fire engines from Chichester and Bognor were called to the school at 0730 GMT.
The first floor has now been sealed off to allow fire investigation officers and police to examine the cause of the blaze.
In December, two classrooms were burnt out and two others damaged by smoke in a fire which started on a Saturday evening and affected both the first and second floors.