A serious collision involving two lorries has closed the M1 northbound between junction 13 and 14.
Traffic is queued back to the Flitwick turnoff. A diversion has been put in place via J13, to join the A421 towards Milton Keynes.
Continue to Brinklowand, turn right onto the A4146 northbound, on to the Fox Milne roundabout and turn right on to Childs Way, then the A509 northbound and re-join M1 at J14.
The motorway is not expected to re-open until 1.15pm this afternoon.
An air ambulance was on scene earlier this morning.