- 12 updates
Thames Valley Police are appealing for information after a highly corrosive substance was left on the M1 near Newport Pagnell forcing the closure of the road for most of yesterday.
Hundreds of cars and lorries were trapped on the motorway while the bomb squad investigated a container filled with acid-like liquid found under a bridge near Newport Pagnell.
There is no suggestion the incident was terrorist related but the police want to know how it got there.
Thames Valley Police have confirmed that the suspicious package on the M1 is not terror related.
However they say it is a corrosive chemical and the southbound carriageway will stay shut while an extensive clean up goes on.
The M1 northbound has finally reopened after more than eight hours.
It was closed while police and emergency services investigated a suspicious object under a bridge at Newport Pagnell.
The object was discovered not to contain explosives.
Thousands of drivers were stationary in queues for hours. The southbound carriageway is still closed.
Frustrated travellers played football, frisbee and touch rugby on the M1 after police closed the motorway for hours.
Thousands sat in gridlock from at least 8am, when Thames Valley Police closed the three-lane motorway between junctions 14 and 15 because of a "suspicious object".
Liz Searle, chief executive at the Keech Hospice in Luton, said she had been impressed by the good humour of everyone trapped on the side of the road.
"Everybody was being so helpful and chatty and high-spirited," she said, "which is lovely to see despite the circumstances."
Mrs Searle escaped the gridlock when police began to turn traffic around.
A spokesman for Highways England said the amount of traffic trapped was "down to about three or four kilometres" from a previous high of six kilometres, but could not comment on the details of the "suspicious object".
Thames Valley Police say investigations have revealed the object that's closed the M1 for seven hours does not contain explosives.
Investigation by the EOD [explosive ordnance disposal] can confirm that there is no explosive element to the object found," said Thames Valley Police in a statement.
Investigators are continuing a chemical analysis of the object to determine its make-up.
Aerial footage showed a bomb disposal robot dragging a black rubbish bag off the hard shoulder, which appeared to have contained a liquid and yellow substance.
A bomb disposal team has been seen making its way to the suspicious object on the M1 at Newport Pagnell.
The lorry went past stationary traffic on the motorway using the hard shoulder.
Traffic trapped on the M1 is being turned round so drivers can exit the motorway.
Highways England say it will take some time to release the drivers.
The road has been closed since just after 8am while emergency services investigate a suspicious object found under a bridge at Newport Pagnell.
Thousands of drivers are trapped within the closures on the M1 while emergency services work to investigate the suspicious object.
Chantelle Hambridge says she's been stationary on the M1 for one hour and 40 minutes.
Highways England says work to release the trapped drivers will begin as soon as possible but is warning it has not yet started and will take time when it does begin.
There are reports that some people have left their cars and are walking back to junction 14 to use services at Newport Pagnell.
Some drivers say the road appears to have reopened Northbound but is still stuck going South.
Drivers trying to use the M1 are facing five mile queues as police investigate a suspicious object found under a bridge at Newport Pagnell.
National Express says 45 minutes is being added to travel times and coaches are being diverted.
Latest ITV News reports
Drivers on the M1 were trapped for hours as police dealt with a suspicious object spotted under a bridge near Newport Pagnell