Sanchez stars to get Gunners in groove after crowd chaos

PARIS - Alexis Sanchez scored a stunning goal as Arsenal came from behind to beat Cologne 3-1 on Thursday in a Europa League opener that was delayed for an hour due to crowd trouble.

Kick-off in the Group H clash at Emirates Stadium was put back until 9:05 pm local time in the interests of "crowd safety" after problems caused by thousands of ticketless Cologne supporters arriving at the north London ground.

Police confirmed four arrests were made before kickoff while there were reports of scuffles inside the stadium.