A Good Samaritan who helped extinguish a car fire in New Bedford Road on Saturday (April 20) is sought by police as they investigate the arson.
The man called emergency services to the scene at about 5am, where a black Range Rover was on fire.
He stayed there trying to extinguish the flames until the fire service arrived but left without giving his details.
He was driving a red new-style Vauxhall Astra and is described as a tall white man in his late 30s.
If you are the man in question or can help identify him, call Det Con Marian Khajavelidze in confidence on 01582 394270 or Beds Police on 101.