Emergency services and an air ambulance are in attendance following a crash on the A15.
The crash was reported to Lincolnshire Police at 2.15pm between the Holdingham roundabout and the A153 roundabout.
Police have confirmed that there has been one serious injury.
The crash involves two cars and a caravan towed by one of the cars.
Road closures are in place and motorists are asked to avoid the area.