PARIS - A high school student entered a school in western France's Nantes with a knife and stabbed at least four students Thursday afternoon, local media reported, citing the police.

One of the victims died from injuries, according to BFMTV, citing multiple sources.

Teachers stopped the attacker before police arrived, BFMTV said, adding that the attacker, a second-year high school student, has been detained.

Speaking at the scene, French Interior Minister Bruno Retailleau said that some 50 investigators have been deployed and worked "tirelessly" since. Over 70 interviews have been conducted, he added.

French Prime Minister Francois Bayrou has called for an intensification of controls implemented around and within schools following the attack.

The prosecutor in Nantes is expected to hold a press conference to give more details about the attack on Friday.