Arsonists have caused damage put at thousands of pounds to a primary school in North Lincolnshire for the second time in six months.
Fire fighters had the incident quickly under control
Thirty-four firefighters were needed to tackle the blaze at Priory Lane Infants School on West Common Gardens in Scunthorpe on Wednesday night.
Crews were called to a wooden classroom at 2134 GMT and found the building well alight.
A spokesman for Humberside Fire and Rescue said police were investigating.
A nearby garage had to be sprayed with water to prevent the flames spreading, but the classroom was badly damaged.
Arsonists were also blamed for a fire at the school in September 2003.