Firing to scare some camels off his farm but killing one of them

Q: A person had a farm and some camels infringed on it. The farm owner used to guard the farm from the infringing camels every night and used to fire some shots from his rifle so as to scare them and keep them away until the morning. One night he fired some shots so as to scare the camels, but one or some shots hit the abdomen of a she-camel and it died at once. The man knew the owner of the dead she-camel, told him what happened, and paid him its price. He is asking: Is he sinful? Should he pay Kaffarah (expiation) or is there nothing more due on him?

A: The farm owner should surround it with a fence to prevent the camels and other animals from getting into it. Since he already paid the price of the she-camel which he killed by mistake, then there is nothing on him.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.