Two security agents and two migrants were killed in a shooting in Loon-Plage near the northern city of Dunkirk, French media reported on Saturday, citing security sources.
A 22-year-old man turned himself in to nearby authorities following the shooting, saying he had been the attacker and had also killed a fifth person in a nearby town earlier that day, according to French media.
Authorities found three more weapons in the man's car, French media reported.
Representatives for the Interior Ministry and the Justice Ministry did not immediately respond to requests for comment. It was not immediately clear what the motives were for the shooting.
Loon-Plage, located about 10 kilometres from the English Channel, is the site of a migrant camp.
US strikes Iranian launchers on Larak Island
Nepal teams seek hundreds trapped in hydropower tunnels after deadly floods
Jordan intercepts eight missiles in airpace
At least eight die, 18 missing after ferry capsizes off North Cyprus
