ACT police have published CCTV footage from a white delivery van reportedly stolen from Burn Street in Downer about 4pm on Friday, believed to have been taken while the driver was making a delivery.

The van was allegedly stolen by a man wearing a black cloth face mask. He was described as being of caucasian appearance, tall, of slim build and with short light-brown hair.

Police allege two other people were also involved in all four incidents, which included the theft of vans in Campbell and Wright last Thursday, as well as the theft of a van in Braddon on September 22.

The suspects were seen in the vicinity of two of the alleged thefts in a dark blue Subaru Outback, which was also reported stolen. Police say they have since located the Subaru.

Anyone with CCTV or dash-cam footage from Burn Street or Frencham Street, Downer between 3.30pm and 4.15pm on Friday has been asked to see if they have captured footage of the white van or the dark blue Subaru.

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ACT Policing Officer in Charge Detective Inspector Adrian Craft said police believe the offenders may be following delivery drivers, looking for the opportunity to steal their vans.

"These drivers should be aware of their surroundings and if they believe they are being followed either call police safely or drive to the nearest police station," Detective Inspector Craft said.

He said vehicle security should be taken seriously and motorists needed to be vigilant at all times.

"Don't make your car an attractive target by making it easy to steal," Detective Inspector Craft said.

Police have reminded drivers to never leave a vehicle unattended with the engine running or unlocked with the keys inside and to always lock vehicles.

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