Investigators believe a fire which destroyed part of a Scunthorpe primary school was started deliberately.
More than 50 firefighters tackled the fire at Priory Lane Junior School, in Ashby, which started on Monday night.
Parents of the 260 pupils were told to keep their children at home while staff helped with the clean-up operation.
Structural engineers are still investigating whether the school hall can be saved from demolition.
The fire, which is believed to have started in a hallway, caused part of the school roof to collapse and extensive smoke damage to classrooms.
The school will not open again until next week at the earliest.