It was around 8pm that a bus passed under a bridge on national road 23 in Älmhult.
– Then young people must have stood on a bridge and thrown down a large stone, says Evelina Olsson, police spokesperson.
The stone smashed the windshield of the bus, but the driver is said to be physically unharmed.
The police have been on the scene and will file a report of vandalism.
– We have not found any suspects, says Evelina Olsson.