Police forensic teams are carrying out a fingertip search at a stretch of Oxford's bypass in connection with an armed bank raid.

Police found cash boxes at the Heyford Hill roundabout near Sainsburys last night. Forensic teams are now carrying out a search of the area.

Thousands of pounds was stolen in a raid on a Group 4 Securicor van which was delivering cash to The Abbey bank in Banbury Road, Summertown on Tuesday morning.

A member of the public found the three cash boxes on a grass embankment on the southern bypass between Sainsburys supermarket and Rose Hill estate yesterday afternoon.

Acting Det Insp Kevin Elkins, of Oxford CID, said: "Have you been in the Heyford Hill area in the last few days? Did you see anyone acting suspiciously - in Rose Hill, around the nearby Sainsbury's supermarket or along the bypass?

"Did you see a vehicle parked up on the road? If you have any information, please call me."

Police are continuing to search for the four robbers who were all masked and brandishing handguns.

Police are also investigating links with a similar raid on a branch of the same bank in Abingdon three weeks ago.

Police have also seized a white Corsa and silver Mercedes in connection with the raid.

Anyone with information should contact police on 08458 505505 or speak anonymously to Crimestoppers on 0800 555 111.