A security van driver was threatened with a gun and handcuffed to his van during a robbery.
The man, from the Derby area, was stopped by a gang at a petrol station on the A38 at Fradley, near Lichfield, Staffordshire, on Monday morning.
He was forced into a waiting van before his own vehicle was stolen, and both were driven to an isolated area.
The gang transferred several thousands of pounds to a white Transit van, which was then driven towards the A38.
'Dangerous criminals'
Staffordshire police said a 7.5 tonne truck was seen at a Little Chef cafe on the A38 about five miles from the petrol station shortly before the driver was first attacked.
This and a white Transit van found in Whittington Road have been recovered by police, and examined for possible links.
Detectives think people may have seen one of the robbers standing at a nearby road junction on Huddlesford Lane while the robbery was taking place.
Det Insp David Ward said: "Clearly this was a pre-planned robbery by armed and dangerous criminals.
"The robbery victim was badly shocked by his ordeal but was otherwise uninjured."