The Independent Police Complaints Commission (IPCC) has been called in after a collision on the M4 at Newport in which five people died.
The Independent Police Complaints Commission (IPCC) has been called in after a collision on the M4 at Newport in which five people died.
A sixth person has been seriously injured in the crash at 0320 BST which has shut the motorway both ways.
A sixth person has been seriously injured in the crash at 0320 BST which has shut the motorway both ways.
Three young men in one car died at the scene and a fourth, 18, is being treated in hospital, the Welsh Ambulance Service confirmed.
Three young men in one car died at the scene and a fourth, 18, is being treated in hospital, the Welsh Ambulance Service confirmed.
A couple - a man and a woman in the second car - also died at the scene.
A couple - a man and a woman in the second car - also died at the scene.
The collision between a Red Ford Mondeo and a Red Volvo 940 happened happened on the eastbound carriageway between junctions 25A and 25 in Newport.
The collision between a Red Ford Mondeo and a Red Volvo 940 happened happened on the eastbound carriageway between junctions 25 and 24 in Newport.
The IPCC has said it has been asked to carry out an investigation.
The IPCC has said it has been asked to carry out an investigation.
Gwent Police have said the M4 will be closed for some time
Gwent Police have said the M4 will be closed for some time
A spokesman said: "I can confirm that Gwent Police have referred the incident to us.
A spokesman said: "I can confirm that Gwent Police have referred the incident to us.
"I haven't got any further details but I know it is on the grounds that, prior to the incident, there was some form of police involvement."
"I haven't got any further details but I know it is on the grounds that, prior to the incident, there was some form of police involvement."
The M4 is closed between J24 (Coldra) and J28 (Tredegar Park) eastbound and J24 and J26 (Malpas Road) westbound.
The M4 is closed between J28 (Coldra) and J24 (Tredegar Park) eastbound and J24 and J26 (Malpas Road) westbound.
Gwent Police has said the motorway will be closed for the foreseeable future, and they are urging motorists to avoid the area.
Gwent Police has said the motorway will be closed for the foreseeable future, and they are urging motorists to avoid the area.
Diversions have been put in place along the A48 Southern Distributor road towards Newport.
Diversions have been put in place along the A48 Southern Distributor road towards Newport.
There are currently tailbacks of up to five miles.
There are currently tailbacks of up to five miles.
A police spokesman said: "Every effort is being made to open up the carriageways of the M4 as soon as possible."
A police spokesman said: "Every effort is being made to open up the carriageways of the M4 as soon as possible."
Westbound traffic is being diverted off onto the distributor road at J28 and there are seven miles of tailbacks reported back to J30 (Cardiff Gate).
Westbound traffic is being diverted off at Junction 24. Eastbound traffic is being taken off onto the distributor road at J28. Seven mile tailbacks are reported back to J30 (Cardiff Gate).
There is also heavy traffic on all main roads around the motorway.
There is also heavy traffic on all main roads around the motorway.
Last month the M4 was closed around Newport for many hours after a lorry driver died in an accident at Tredegar Park.
Last month the M4 was closed around Newport for many hours after a lorry driver died in an accident at Tredegar Park.
At their worst, tailbacks for drivers after that crash reached 10-miles.Are you caught up in the accident? Please send us your comments using the form below.
At their worst, tailbacks for drivers after that crash reached 10-miles.Are you caught up in the accident? Please send us your comments using the form below.
