The M40 is shut between Handy Cross and Stokenchurch this afternoon - after a serious crash that has left three people injured.

An air ambulance is on the scene of the two-car crash, which happened northbound between junction 4 and 5 at around 2pm.

The road is still shut completely between the two junctions and all three injured people have been taken to hospital. 

Thames Valley Police are on scene along with Bucks Fire & Rescue, paramedics, the air ambulance and Highways England traffic officers.

Police want to hear from anyone who may have dash-cam footage or who saw what happened. 

Investigating officer, PC Chris Fallon of the Joint Operations Roads Policing Unit based at Taplow, said: “We are appealing for any witnesses to this collision to please come forward.

“Additionally we are asking anyone who has a dash-cam and was travelling on the M40 at around 2.10pm between junctions 4 and 5 in either direction to check their footage and please get in touch if you think it will aid our investigation.

“We are aware that a number of vehicles may have been travelling at speed on this stretch of the M40 prior to this incident and we are asking anyone who may have seen this to please also get in touch.”

Anyone with information should call 101 quoting reference 710 23/02/20.

Diversion info for those approaching the closure:

Northbound traffic exit at J4 and follow the route marked with a hollow diamond symbol on road signs. This will route traffic via the A404 north to High Wycombe and then the A40 west to Stokenchurch to rejoin the M40 at J5.

Southbound traffic exit at J5 and follow the route marked with solid square symbol on road signs. This follows the above route in reverse - A40 east to High Wycombe and then A404 south to J4 of the M40.