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Detectives have appealed for dash cam footage after a "serious collision" on a country lane.
It involved one car and happened in Littlebury, near Saffron Walden in Essex, in the early hours of Thursday.
Crews remained at the scene in Strethall Road in the afternoon, shutting the route in both directions.
"If you were in the area earlier today and witnessed a collision or have dash cam footage of the incident, please get in contact," an Essex Police spokesman said.
