Firefighters wearing breathing apparatus had to tackle a blaze at a factory on Thursday night.
They were called to GKN Aerospace in Percival Way, Luton, at 10.45pm, and spent an hour and a half putting out the flames.
Crews from Luton, Stopsley, Dunstable, Hemel Hempstead, plus an incident support unit from Leighton Buzzard attended.
The cause of the blaze has not yet been confirmed.