Zamalek's die-hard supporters clashed with Egyptian police before a Premier League game at an army-owned stadium on Sunday. Police used tear gas to disperse members of hardcore fan group Ultras White Knights in front of Cairo's Air Defence Stadium, a few hours before Zamalek take on ENPPI in a top-of-the-table clash. Several vehicles were damaged amid the melee, Ahram's Arabic news website reported. Reports said the clashes occurred after Ultras White Knights members tried to attend the game without buying tickets. A league crowd ban that has been in place since the 2012 Port Said tragedy, which left over 70 Ahly fans dead, was partially lifted as authorities said they would gradually allow fans to return to the stands. Only 10,000 supporters are allowed to attend the match against ENPPI, with 5,000 tickets up for public sale and as many distributed by the club itself. "You do not understand anything. You are not allowed to get in by force. No one will be allowed to attend the match without tickets," Zamalek board member Ahmed Mansour, son of controversial chairman Mortada Mansour, said on his Facebook page. "Football is only for respectable fans. No thugs are allowed here," he added. The match is scheduled to take place at 19:30 Cairo time (17:30 GMT) but it remains to be seen if it will go ahead as scheduled, with many Zamalek fans surrounding the team bus outside of the stadium. (For more sports news andupdates, followAhramOnlineSportson Twitter at@AO_Sportsand onFacebookatAhramOnlineSports. http://english.ahram.org.eg/News/122539.aspx