Warning from Manuel Valls came as French MPs debated extending the state of emergency after the Paris attacks.
The airline has also begun dismissal procedures against a fifth employee over violent protests as management announced a plan to cut 2,900 jobs.
French interior minister says a 25-year-old, under surveillance, was arrested last month over plan to attack major French Mediterranean naval base.
Loubna Abidar, who played a prostitute in Moroccan drama Much Loved, banned in the north-African country, was attacked in Casablanca.
Photos of bird preservation militants attacked by furious, half-naked local man with a spade as they freed chaffinches from illegal traps go viral.
Internal probe finds staff on Thalys train, accused of leaving passengers to deal alone with gunman, had in fact showed "best possible" reaction.
The images, filmed by one of three US men who overpowered the gunman, shows him trussed inside the carriage and his bundle of weapons.
Arrested gunman's given identity is that of a 26-year-old Moroccan known to Spanish, French authorities for links to radical Islamist movement.
Police now describe the incident in a park at Reims in northern France as a fight between two rival girl gangs with no religious overtones.
The woman, 21, was sunbathing in a public park in Reims when a group of girls attacked her reportedly after a row over her simple clothing.
The Paris public prosecutor said one of three men arrested this week for plan to attack a French naval base admitted receiving orders from Syria.
Romain Ferrand, 16, recovering from a foot injury, said he was surrounded by a pack of wolves who dispersed after he fired his rifle in the air.
Former French president Sarkozy came under fire for singling out two non-white female ministers in a largely white government as incompetent.
The male victim was on a sail trip with friends off the French Pacific Ocean archipelago when a bull shark attacked him metres from their boat.
Al-Qaeda in the Arabian Peninsula announced death of Nasr bin Ali al-Ansi, who claimed his group organised attack on French magazine staff.