Swiss police say several people are dead or injured in a severe crash involving a truck, a Swiss postal bus and a car in northern Switzerland.

Police in Aargau canton (state) say the road between the towns of Endingen and Lengnau were closed because of the early morning collision. Swiss postal buses carry passengers in rural and remote areas.

The police said Tuesday that several people in the bus were killed or seriously injured and two people who were in the car were seriously injured, but they did not provide specific numbers.

Several ambulance crews along with police and firefighters were summoned to the scene.