A school bus and a truck collided with each other on a German highway from Berlin to Dresden, injuring 17 people and blocking the traffic, police said Wednesday.

The accident happened at around 7:30 local time. Four adults were seriously injured, and 11 young people, all more than 14 years old, were slightly hurt, police said.

Investigation was under way. Police said the driver of the bus probably overlooked the truck at the exit of the highway. The Autobahn 13 was completely blocked at the junction.