Grasse: One intruder entered into the Tocqueville High School and opened fire in the southern town of Grasse in the French Rivera on Thursday.
Several people were injured in the shooting..
One person was arrested and another is on the run after the shooting incident at Tocqueville High School.
All schools in the town some 40 kilometres (25 miles) west of Nice have been locked down.
Interior Minister Bernard Cazeneuve cut short a trip to the northern Somme area because of the Grasse shooting, as well as a letter bomb blast at the offices of the International Monetary Fund in Paris on Thursday.
The incident comes in the wake of the French government issuing a high alert about a terrorist strike.