The Tunisian national who killed a police administrative worker last Friday near Paris had watched videos glorifying extremism just before carrying out his attack, said France's anti-terrorism prosecutor Jean-Francois Ricard.
Ricard told a news conference on Sunday that the official investigation had shown that the assailant, identified as "Jamel G", looked at the videos on his phone just before his knife attack on the police worker, a mother-of-two called Stephanie.
Stephanie died from stab wounds, while 37-year-old Jamel G was subsequently shot dead by police after the attack at a police station in Rambouillet, a commuter suburb south of Paris.
French President Emmanuel Macron said last Friday, in reaction to the killing in Rambouillet, that France had again been the victim of a terrorist attack.
Ricard said France was working with Tunisian authorities in its probe into the Rambouillet attack. The Tunisian Embassy in Paris condemned the attack, in a statement issued this weekend.
French authorities detained a fifth person Sunday in the anti-terrorism investigation seeking to identify potential accomplices and motives.
Ricard said police are questioning a cousin of the suspect.
Jamel G. entered France illegally in 2009 and was given residency papers at the end of 2019, he added.
