Islamist knifemen forced priest, 84, to kneel and filmed his death as they slit his throat: Hollande says 'France is at war with ISIS' after jihadists storm French church during Mass chanting 'Allahu Akbar'
Priest had throat cut while another hostage is fighting for life after knifemen burst into Normandy church at 9am
Reports that one of the attackers shouted 'Allahu Akbar' as they launched assault at Gambetta Church near Rouen
Vatican has condemned the 'barbaric' killing of the 84-year-old priest and an anti-terror investigation is underway
ISIS claim responsibility for the atrocity while Francois Hollande says France is 'at war' with the terror group
The attackers lived locally and one had electronic tag having been jailed in France for trying to travel to Syria
French authorities revealed this afternoon that they have arrested a third man in connection with the attack
Nicolas Sarkozy calls for 'merciless' response as ex-PM said 'everything is being done to trigger a war of religions'
By Peter Allen In France and Julian Robinson and Imogen Calderwood For Mailonline
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