LONDON , England ( CNN ) -- A fan of English football club Arsenal has been injured after the bus he and other supporters were traveling in was ambushed before the sides ' Champions League clash in Rome , Wednesday night . Winners : Arsenal beat Roma 7-6 on penalties after one of their fans was injured before the game . A spokesman from the British Embassy in Rome told CNN the fan was understood to have suffered wounds to the leg -- but it was unsure if he had been stabbed or injured by broken glass . The spokesman said the mini bus , which was not an official tour bus , became lost near the stadium and `` ended up at the wrong part of the ground '' . Roma fans nearby set about attacking the bus , the spokesman said . `` They smashed the windows and then one of them managed to get on the bus . This appears to be where the injury occurred , '' he said . Police were quick to arrive and the bus managed to move on to safety , where the fan was treated for the wound , he said . The visiting side went on to win the tie 7-6 on penalties after Roma won the game 1-0 , leaving the two-match tie level 1-1 on aggregate . Arsenal had distributed a booklet to its estimated 3,500 traveling fans warning that they were `` at risk '' if they traveled alone to the Stadio Olimpico . The booklet warned supporters to stay clear of areas that were known gathering points of Roma 's `` Ultra '' fans -- a group known for creating conflict with rival supporters . Last month ten football fans were shot dead in the south of Nigeria on the way to support their team . The victims were traveling supporters of the Ocean Boys Football Club in Nigeria . Also in February , one fan was killed and at least 40 more injured when violence broke out at football matches across Brazil . In 2007 , Manchester United fans were injured after violence in two separate incidents with Roma fans when the teams met in Rome . In 2003 five England fans suffered gunshot wounds during a violent incident in Zurich , Switzerland , before the side played a Euro 2004 qualifier with Liechtenstein .
Fan injured during ambush on bus before Champions League game in Rome . Arsenal bus attacked when it arrives at wrong part of Stadio Olimpico . Windows on bus smashed by Roma fans and one fan enters bus . Police say they are investigating the incident as a possible terrorist attack.