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.
Our thoughts are with the family of the man who died and all those involved and affected by yesterday’s incident.
A full investigation by the Independent Police Complaints Commission (IPCC) is underway, and we are working to support this ongoing investigation. At the request of the IPCC, The Portbury Hundred (A369) is still closed as they continue their detailed search of the scene to ensure they capture all of the evidence.
They are very much aware of the disruption their continuing road closure is having on people who live and work in Portishead.
We fully understand just how disruptive this has been for our local communities and their frustration at the amount of time the closure has been in place. Our own Police and Fire staff at Headquarters in Portishead have been similarly affected by the congestion.
The IPCC investigation at the scene must run its course, but at the same time we have impressed upon them the need to open the road as soon as it is possible to do so.
We are very grateful to local people for their patience and understanding and fully appreciate the tremendous inconvenience that this has caused. As soon as there is any news about re-opening the road we will share this with you.
The inquest into the driver fatally shot by police, after reports of him waving a gun on the M5, opened today.
Spencer Ashworth whose last known address was in Portishead was shot by firearms officers on the A369 Portbury Hundred on Wednesday morning.
Police say a man died this morning in an incident involving police firearms on The A369. The incident is under investigation by the IPCC.