The Midlands Air Ambulance has flown from the scene to the major trauma unit at Royal Stoke University Hospital.

The A5 remains closed at this time.

Midlands Air Ambulance helicopter is now leaving the scene.

The Midlands Air Ambulance is at the A5 crash scene.

It has flown from over the border to the location of the serious crash near Llyn Ogwen.

West Midlands Air Ambulance at scene

This is the location of the A5 crash - with the incident a short distance from Llyn Ogwen.

A5 crash location

North Wales Police said:

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The A5 has been closed in both directions after a serious crash.

The incident is south of Llyn Ogwen.

There is a warning that the route will remain shut for some time.

Updates to follow.