The accidents happened in Swat and Malakand districts.
A speeding car crushed to death four persons and injured another after the driver lost control over the wheels in Sangota area of Swat, police said.
The injured person was shifted to Peshawar hospital. The police have arrested the driver of the car.
In a separate accident, a vehicle hit two school children and injured four others in Jalala area of Malakand district.