Within the Catholic Church, the concept of possession by demons is an accepted belief.
It is sometimes used to explain murderous behaviour, as in the recent murder of 85-year-old French priest Fr Jacques Hamel in his church in the French city of Rouen in July.
When two Islamist militants acting in the name of jihadist group Islamic State (IS) burst into the church and stabbed Fr Hamel, he tried to fend them off, crying out "Be gone, Satan!" - an apparent attempt at exorcism.
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