UPDATED: The man who shot a French police officer dead and wounded two others on Paris' Champs Elysees had been flagged as an extremist.
Two police officials had no other details about the attacker. He was shot dead after opening fire with an automatic weapon on a police van on Thursday night.
They spoke on condition of anonymity to share information about the ongoing investigation.
A French interior ministry spokesman said a second policeman had not died of his wounds from an attack in Paris, as had been earlier reported.
"An automatic weapon was used against police, a weapon of war," the spokesman, Pierre-Henry Brandet, told reporters, adding that the "terrorist threat" in the country remained high.
Brandet said the shooting started at shortly after 9pm when a car stopped alongside a stationary police car.
"A man immediately got out and opened fire on the police car, fatally wounding a police officer ... He also wounded a second one, it would seem very seriously," he said.