France's radical left is under pressure after the killing of a student in Lyon was blamed on "anti-fascist" militants.
Quentin Deranque, a 23-year-old maths student and nationalist activist, died on Saturday, two days after being beaten up on the street by a group of young men.
State prosecutor Thierry Dran told a news conference on Monday afternoon in Lyon that a murder investigation has been opened into the death.
He said that Deranque was kicked and punched by "at least six" individuals, and that the autopsy showed fatal damage to his skull and brain.
On Thursday afternoon Deranque had given support to a hard-right feminist collective Némésis, which staged a small protest against a left-wing politician's visit to Lyon's Institute of Political Studies (IEP), commonly known as Sciences-Po.
