A 34-year-old homeless man has been arrested on suspicion of arson after a fire at The Avenue School this morning.

Police and firefighters went to the school and children's centre in Warminster just after 3.20am this morning to find a portable building alight.

It is estimated that several thousand pounds of damage was caused .

Police said that an investigation, which is expected to involved Dorset and Wiltshire Fire and Rescue Services, was now taking place.

Nobody was injured during the incident but the school in The Avenue is shut today while the extent of damage is assessed.

Anyone who witnessed anything suspicious in the area in the early hours of this morning is asked to call PC Christopher Cook on 101, alternatively call Crimestoppers on 0800 555 111, where information can be left anonymously.