A fire at an industrial estate involving three fuel tankers is being treated as suspicious, police have said.
Ten fire vehicles attended the "major incident" at Lady Lane Industrial Estate in Hadleigh, Suffolk, at about 6.45pm on Friday.
Firefighters managed to extinguish the blaze before midnight and no injuries were reported.
The tankers contained a total of 35,750 litres of kerosene, gas oil and diesel, said police.
In a statement, Suffolk Constabulary said: "This morning, Saturday 17 November, fire and crime scene investigators have been at the scene to try to determine the cause of the blaze.
"These inquiries are continuing but the fire is being treated as suspicious."
Residents in the area were warned to stay indoors and keep their doors and windows closed as a 300-metre cordon was set up around the blaze and the A1071 was closed to traffic until later in the night.
A council spokesman said: "Suffolk fire and rescue has extinguished the fire at the Lady Lane Industrial Estate.
"Firefighters worked throughout the evening to prevent the fire spreading from three mobile fuel tankers to other parts of the industrial estate."