English Premier League football club Arsenal have dropped their first points of the Champions League campaign, beaten two-one by Germany's Borussia Dortmund.
The result leaves them tied on 6 points at the top of Group F with Dortmund, and Italy's Napoli, who beat Marseille two-one in France.
In other games, Barcelona have been held one-all at AC Milan, Celtic have claimed a vital two-one win over Ajax, and a Fernando Torres brace helped Chelsea beat Schalke 3-nil.
