Two men armed with knives have taken several people hostage in a church in a town in France's northern Normandy region, a police source said.
The source said between four and six people were being held by the assailants in Saint-Etienne-du-Rouvray.
Muslim leaders say they don't want to "taint" Islam by burying Adel Kermiche who slit the throat of 85-year-old priest Father Jacques Hamel.
Islamic State's Amaq news agency released footage showing French attacker Abdel-Malik Nabir Petitjean urging Muslims to destroy the country.
The self-styled Islamic State has released a video of the French church attackers pledging allegiance to the group.