Firefighters have put out a warning after arsonists set light to a derelict building in Downham.
Two crews of firefighters from Downham and Lynn were called to a site in Daisy Lane on Monday night after smoke was seen billowing from the empty building.
Rubbish had been set alight within the building, which was once thought to be a garage.
Downham watch manager Kim Scotney said the fire had been started deliberately.
He also said a group of youngsters had been seen in the building before the fire.
He said: “This could have escalated into a bigger fire and it is right next to the railway line. It could have been a lot worse.
“We are asking people to keep an eye on their children during the holidays.”
A crew from the Downham station were joined by colleagues from Lynn south in attending the fire, which had been reported at just before 11.30pm.
Mr Scotney said: “There was a bit of smoke coming out of the a hole in the roof.
“We had no problem putting it out.”
Police are working with firefighters on the incident.
A spokesman said; “Police received reports of a fire at a derelict building on Daisy Lane in Downham Market shortly after 11.45pm on May 25.
“We are working with fire officers to establish the cause of the fire and enquiries continue.
“Anyone who may have witnessed or have any further information on the incident should contact Downham Police Station on 101.”