Firefighters had to tackle a blaze at a Kirklees school last night.
Police are treating the cause of the fire, in a classroom at Whitcliffe Mount School, Cleckheaton, as suspicious.
A passer-by saw the fire and called the emergency services at about 11.30pm last night.
Firefighters gained access through windows at the school and quickly had the blaze under control.
But there was considerable smoke and heat damage to the classroom.
The school was expected to open as normal today, with the classroom sealed off.
Police are investigating.
In unrelated investigations, police would like to speak to the people pictured in the image gallery below. The people pictured in the images may be witnesses as well as suspects. If you recognise anyone, contact police on 101 quoting the reference number on the image caption.