Three people were killed in a knife attack at a church in the French city of Nice, earlier on Thursday.
Nice Mayor Christian Estrosi said there had been a “terrorist attack at the heart of the Notre-Dame basilica”.
One elderly victim who had come to pray was “virtually beheaded”. One suspect was shot and detained shortly afterwards.
The French city’s mayor spoke of “Islamo-fascism”, as he said, adding that the suspect had “repeated chanted ‘Allahu Akbar’.”
President Emmanuel Macron is on his way to the scene, while France’s national anti-terror prosecutors have opened a murder inquiry.