French authorities on Monday opened a murder investigation after a 23-year-old man died from a severe brain injury following an attack on the streets of Lyon last week. Lyon's public prosecutor Thierry Dran announced the probe at a press conference, saying that Quentin Deranque had been attacked by "at least six" people on Thursday.  The victim was part of a group of far-right activists protesting the appearance of a left-wing politician speaking at a university in the western city of Lyon.