Police are appealing for witnesses to a serious collision on the A16 near Boston yesterday afternoon.
The crash involved a HGV and a private ambulance.
It happened at around 1.30pm on the road between Sibsey and Boston, near Turn Road and the Gulf petrol station.
The male driver and the female passenger in the private ambulance were seriously injured.
Lincolnshire Police said in a statement: “If you saw the incident or have any dash cam footage, please let us know.”
Anyone who witnessed the collision should call 101 quoting incident number 224 of November 7.