Portishead shooting: West Mercia and Gloucestershire police facing probe
Two further police forces are facing investigation after a man died in an armed police shooting near Bristol.
Officers opened fire on a car near junction 19 of the M5 at 09:30 BST on Wednesday, according to an eyewitness.
West Mercia Police said it received a call at 08:30 about a driver pointing a gun on the M5 in Worcestershire.
The force, and also Gloucestershire Constabulary, have reported themselves to the Independent Police Complaints Commission (IPCC).
The IPCC has already launched an investigation into Avon and Somerset Police, following the shooting at Portishead.
West Mercia Police said it received the tip-off of the suspect pointing a gun at another motorist, when he was close to junction eight of the M5, near to Strensham services and the M50 junction.
An hour later a man was shot on the Portbury Hundred (A369) close to Gordano services.
A spokesman for West Mercia Police said the tip-off was "passed on to the Central Motorway Policing Group" and the IPCC was also informed.
The IPCC said a member of the public made a report to West Mercia Police and information was then passed to Gloucestershire Constabulary.
A spokesperson added they were "assessing the referrals to see what, if any involvement we should have in investigating the West Mercia and Gloucestershire response to that report".
Earlier an IPCC spokesman said it had been advised officers were "responding to reports of a man travelling on the M5 with a handgun and that he had threatened another motorist".
"What appears to be a non-police issue firearm was found at the scene and will also be subject to examination," he said.
Formal identification of the deceased is due to be made later along with the results of a post-mortem examination.