The Portbury Hundred (A369) near the M5 J19 has reopened following an IPCC investigation into yesterday's fatal incident.
Avon and Somerset Police has thanked people affected by the closure for their patience.
West Mercia Police says it received reports of of a man "pointing a gun at another motorist" near Junction 8 of the M5 an hour before a fatal incident near Portishead.
Avon and Somerset's Police and Crime Commissioner and Chief Constable say their thoughts are with the man who died in yesterday's incident on the A369 near Portishead.
In a joint statement, they confirmed the incident is still being investigated.
The Portbury Hundred remains closed to traffic.
Police have also thanked local people for their patience regarding disruption to traffic.
Police have released an update on this morning's incident in which a man died.
Police say they referred the incident to the Independent Police Complaints Commission and they are now on the scene carrying out an independent investigation.
The road is still expected to remain closed for some time.
Portishead say the Portbury Hundred (A369) from J19 of the M5 to Portishead will remain closed "for a number of hours" following an incident this morning in which a man died.
Avon and Somerset Constabulary say diversions are in place and they are asking motorists to use alternative routes.
The Independent Police Complaints Commission has confirmed it is investigating the scene of an incident this morning involving police firearms in which a man died.
The Portbury Hundred (A369) remains closed to traffic.
Earlier the Great Western Air Ambulance said its helicopter has left the scene.
A hay lorry fire has blocked the A369 Exeter Road.
Emergency services are at the scene - but it's causing long delays in the area.