French prison van attack: Prisoner escapes after two prison officers killed in attack in Rouen

The French Prime Minister, Gabriel Attal, is speaking to the French parliament, after a minute's silence was held there.

"Ours is a country that will never cower to violence, that will remain united," he says.

He adds that "everything will be put in place to track down perpetrators... we will spare no effort or men.

"And I'm telling you, they [the perpetrators] will pay. We owe it to their families, loved ones, prison officers and to all French citizens."