article_snippet.sent: Detective Arlindo Jose Negrao ruled out a fight between rival fan groups.
article_snippet.sent: Detective Arlindo Jose Negrao would not reveal the motive behind the attack, however, saying that could interfere with the probe. '
article_snippet.sent: Through witnesses, we are already exploring a line of investigation, which is not leading we to believe it was caused by fan rivalry,' Detective Arlindo Jose Negrao said at a press conference. '
article_snippet.sent: Police say that the killings, that took place late on Saturday night, are not related to any football rivalry .
highlights_snippet.sent: Police say the killings are not linked to any football rivalry .
  