A lorry driver was rendered unconscious by a fuel thief who used a 'noxious substance' to knock him out before stealing his diesel in Sheffield.
The crook struck while a lorry was parked in a lay-by on the A616 in Ecclesfield overnight on Tuesday into Wednesday last week.
A South Yorkshire Police spokesman said: "Overnight into January 31, a LGV parked in a lay-by was targeted.
"The driver, asleep in his cab, claims that a noxious substance was administered rendering him unconscious.
"A large quantity of diesel was then siphoned from the tank."
Anyone with information should call South Yorkshire Police on 101.