A second man was arrested in Nice last night suspected of being an accomplice of church killer Brahim Aoussaoui.
The 47-year-old is believed to have supplied the suspected terrorist with a mobile phone.
It raises the prospect that this was not a “lone wolf” attack and was more highly organised.
The second man was detained by anti-terrorist police in Nice and charged with being an accomplice to knifeman.
It comes after police sources named the suspect terrorist – who killed three people inside the Notre Dame basilica in Nice – as Brahim Aoussaoui, a 21-year-old Tunisian who was carrying forged Red Cross papers.
Police described the scene as “a vision of horror”, and President Emmanuel Macron said France is “under attack”.
Armed officers cornered the suspect near the Nice church and shot him in the shoulder.
He shouted “Allahu akbar” – Arabic for “God is greater” – as paramedics treated him before he was taken to hospital.
One victim of the attacks was named as Brazilian-born Simone Barreto Silva.
The 44-year-old had lived in France for 30 years and had three children, the Brazilian Consulate in Paris has confirmed.
Reports in Brazil claim she had three sons, though her Facebook profile shows two boys and a girl of unknown age.
The other two victims were reportedly beheaded by the attacker’s 12-inch blade.
Another victim, Vincent Loques, 45, was a warden of the Notre Dame basilica.
The church officer and an elderly woman died on the spot.
France was put on its highest alert – terror attack emergency – amid yesterday’s stabbings and other incidents.
A man making a Nazi salute and waving a gun at passers-by was shot dead by officers in Avignon.
In Saudi Arabia, meanwhile, state television reported that a Saudi man had been arrested in the Red Sea city of Jeddah after attacking and injuring a guard at the French consulate.
The French Embassy said he was in hospital after a knife assault though his life was not in danger.
After arriving in Nice, President Emmanuel Macron said: “Once again, our country has been hit by an Islamist terrorist attack.
“Once again this morning it was three of our compatriots who fell in this basilica. It is France that is under attack. We will not give in to any spirit of terror.”
The mayor of Nice, Christian Estrosi, said: “It’s time now for France to exonerate itself from the laws of peace in order to definitively wipe out Islam-fascism from our territory.”
Mr Estrosi said the victims were killed in a “horrible way”.
He added: “Nice has paid too heavy a price in the same way as our country in recent years.”
It is four years since 86 people were killed on Bastille Day in Nice when they were mowed down by a terrorist driving a lorry.
Teacher Samuel Paty, 47, was beheaded by a terrorist in a Paris street two weeks ago for showing pupils a drawing of the Prophet Muhammad.
The mayor of Nice said yesterday’s atrocity seemed to be a “copycat” attack.