The lorry driver is being questioned by police
A lorry driver has been arrested on suspicion of murder after a man died and two others, including a teenager, were injured during an alleged robbery.
The 41-year-old, whose first language is not English, indicated he was set upon in the early morning, police said.
Officers were called to Station Road Industrial Estate, in Coleshill, Warks, where they found the lorry driver.
About 10 minutes later they were told about an injured man in a car. A 36-year-old man died later in hospital.
Officers said the driver, who was described as Mediterranean and was driving a lorry with Greek markings, indicated he was defending himself during an attempted robbery on his curtain-sided lorry at about 0620 GMT.
They said West Midlands Ambulance Service had been called to the M6 between junctions six and seven at about 0630 GMT after reports "a man in a car was bleeding badly".
But on arrival at the scene no-one was found.
They then received a further call saying the occupants of the car were driving to Sandwell Hospital. They arrived a short time later "bleeding heavily" from suspected stab wounds.
One man subsequently died from his injuries and two other males are in a critical condition in hospital.
West Midlands Police closed junction seven northbound of the M6, at Great Barr, as part of the inquiry but it reopened at about 1230 GMT.
Both forces have appealed for anyone with information to come forward.
Det Ch Insp Adrian McGee, of Warwickshire Police, said he wanted to hear from anyone who had "information from any of the locations", including people who saw the men and youth arrive at the hospital.