A group of furious Fluminense fans invaded a training session on Tuesday. Based on video of the event, one of the estimated 30 fans aimed a punch at midfielder Diguinho who hit back and tried to escape through a side door. Reports said fans retreated after a security guard fired two shots into the air. The players went inside and later continued the practice under a police guard while fans continued to argue with club officials. The protest followed the Brazilian clubs' home losses to Corinthians and Santos.