premise: Houllier may have been letting himself get carried away by a narrow victory at one of the league's minnows, but Le Mans coach Frederic Hantz had a more sobre assessment of the situation.
  "Football is a game played by 11 players and at the end, Lyon win," Hantz said.
  Lyon's next league game is away to PSG whose Sunday match against Toulouse had to be postponed for security concerns.
  In it's place, around 1,200 fans marched in protest at the killing of a fan by an off-duty police officer the previous month after a UEFA Cup tie.
  The fan was among a mob attacking a French-Israeli fan and chanting antisemitist and racist slogans.
   What caused the fans to march in protest?
hypothesis: 1,200 fans marched in protest