Multi vehicle crash causes seven mile tailback on M1 near Milton Keynes
The M1 is closed following a crashed involving a number of vehicles, including a tanker containing hazardous chemicals.
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The carriageway is closed at Junction 15 with diversions in place through Northampton to Junction 15A.
Queues of traffic on the approach are up to seven miles long towards Junction 14 for Milton Keynes, say Highways England.
A chemical tanker is among the vehicles involved.
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Hide AdA Highways England spokesman said: "Please be aware that there are delays of up to 30 minutes on the approach to this incident on the M1 northbound near Northampton. There is queuing traffic back towards J14 for Milton Keynes.
"Please allow extra time for your journey today or seek an alternative route if possible."
Emergency services are at the scene.
The crash came hours after an unrelated vehicle fire on the M1 Southbound between J15 and J14.