A transit van filled with tyres caught fire near Daventry town centre yesterday.
Police are appealing for witnesses to the blaze which produced a large and dark plume of smoke over the town as a result of the burning rubber inside the vehicle, which was parked in a yard in Oxford Street.
Northamptonshire Fire responded to the incident at 2.55pm, stating that a fence was also burning.
The cause of the fire is still unknown.
Neighbourhood sergeant for Daventry district Sam Dobbs said the fire had been extinguished in a tweet posted at 4pm on Saturday, and said there were suspicions of a deliberate ignition.
Witnesses or anyone with information about the incident can call police on 101 or Crimestoppers anonymously on 0800 555 111, quoting incident reference number 326.