An ambulance and a council recycling van have collided on the main Londonderry to Belfast road.
It happened at the junction of Glenshane Road and Gulf Road.
The ambulance, which had no patients on board, landed on its side on a grass verge but the two crew were not badly hurt.
Two employees of Derry City Council were in the van but were not injured.
All four were taken to hospital as a precaution.