M1 northbound closed by four-lorry crash
Two people have been injured, one seriously, after four lorries crashed near junction 25 of the M1 in Nottinghamshire.
Emergency services were called to the motorway near Trowell services just after 03:20 GMT and the northbound side was closed between junctions 25 and 26.
The carriageway remained closed until 16:00 GMT.
Police said a fifth vehicle, believed to have been a car, was involved but was not damaged and left the scene.
Officers had initially reported that three people were injured and five lorries were involved.
Lengthy delays have been reported in both directions and on diversion routes.
Two drivers had to be cut out of their cabs and were taken to hospital, where one remains in a serious condition.
It is believed the vehicles crashed in foggy conditions.
Det Ch Insp Andrew Hall said they now think a lorry braked suddenly to avoid a small red car.
"A white vehicle, which is a tanker unit, has hit the back of the HGV which is further up the road.
"As a result of the tanker braking, it has been hit by the third vehicle and then an Eddie Stobart (lorry) has also crashed."
At one stage officers issued an appeal for drivers and passengers on the southbound carriageway to stop slowing to take pictures as it was causing congestion and risking further accidents.
Police have asked the driver of the red car to come forward.