The incident took place on Saturday night in the Stockholm municipality of Sollentuna.
Swedish police received a call from a witness describing “a car speeding around”, from which golf balls were being thrown at pedestrians.
It is not yet known if the driver was alone or accompanied.
According to Aftonbladet, one of the victims was hit on the head and another on the upper body.
Police have located the vehicle but the attacker or attackers remain at large.