Is this killing, which occurred to a person who was riding in the back of a pickup truck and was shot while others were chasing the owner of the vehicle, considered accidental killing or intentional killing, and is it subject to qisas (retribution) or diyah (blood money)?

If a person intends to kill another but accidentally harms someone else, this is considered accidental killing, and blood money (diyah) is obligatory upon the killer, to be borne by his guardians. If a dispute arises concerning the killing or the blood money, it is best to refer the matter to the Sharia (definition) court, as the judge's ruling is binding. It is important to warn against the danger of vendettas and being lenient with bloodshed, because Islamic law has stipulated that the implementation of punishments (hudud) is for the Muslim ruler.