Pope Francis is to fast track the process of canonising an 85-year-old priest whose throat was slit by an Islamic State (Isis) supporter during an attack on a Normandy church.

Usually there must be a five year waiting period before a person can be considered for sainthood. However, the Pope told reporters in Azerbaijan that in the case of Father Jacques Hamel the process will begin immediately, as the witnesses may die or forget details in the interim.

Hamel was killed on 26 July, when two men stormed a church in Saint-Etienne-du-Rouvray during morning mass. A parishioner was also seriously injured in the attack, before both attackers were shot dead by police. The men pledged allegiance to Isis in videos released by the terrorist group after the attack.

Father Jacques Hamel
A picture of French parish priest Father Jacques Hamel is seen during a funeral service at the Cathedral in Rouen Charly Triballeau/ Reuters

On Sunday parishioners gathered for the re-opening of the church following the attack. A rite was performed, "cleansing" the church through the sprinkling of holy water after its desecration, AFP reported.

The murder of Hamel followed an attack in Nice in the south of France days previously, in which an Islamic extremist drove a truck into crowds watching a Bastille Day fireworks display, killing 85.