Firefighters joined the emergency response after three cars were involved in a crash on the A19 in North Yorkshire.
Crews from Thirsk, Ripon and Boroughbridge and a local officer were called out to the A19, near to Thirsk Industrial Park, at around 10.15pm on Tuesday night.
They helped ambulance crews by setting up lighting and carried out safety working at the scene.
A North Yorkshire Fire Service spokesman said that casualties from the first two vehicles were already out, but two occupants in a third vehicle needed help.
All those injured were taken to hospital by ambulance, the spokesman added.