The remote-controlled blast, triggered through an improvised explosive device, hit the vehicle of Qari Salahuddin, an Afghan national who runs a madrassa here, they said.
His two associates who were travelling in the vehicle and a child in the proximity were also injured in the blast that took place near Chamkani vegetable market.
All the injured were rushed to a nearby hospital where doctors said their injuries were not life-threatening.
Salahuddin's vehicle was nearly 10 kilometres away from an Afghan refugee camp when it was targeted, police said, adding that investigators arrived at the scene and collected evidences.