PARIS — A manhunt has been launched for a group of armed attackers who shot and killed two prison officers and injured three more while breaking a prisoner out of a van in northern France, authorities in the country said Tuesday.

Hundreds of regional and national police officers have been deployed to catch the gang who swooped on the convoy of two vehicles at a toll booth near Rouen, Normandy, at 11 a.m. (5 a.m. ET), Justice Minister Eric Dupond-Moretti told a news conference. They were…