UEFA banned flares from stadia yet that did not deter Galatasaray fans from throwing them onto the Emirates Stadium pitch last night, Wednesday.
Arsenal's dominant 4-1 victory over Galatasaray, punctuated by Danny Welbeck's stunning hat-trick, was marred as flares set off by members of the visiting supporters interrupted the occasion.
Arsenal effectively put the game out of reach for Gala inside the first half, as Welbeck scored twice and Alexis Sanchez added a third in the 41st minute.
The trouble started within half an hour, though, as Welbeck's second - an opportunistic strike that capitalised on an Auerlien Chedjou error - prompted one fans in the away section to spark flares and throw them onto the pitch.
In one of the photographs above, Galatasaray's goalkeeper Fernando Muslera can be seen attempting to handle the situation.
Even senior level players from the Turkish heavyweights, like playmaking maestro Wesley Sneijder, appealed for calm and order.
Firecrackers eventually accompanied the flares but Metropolitan police confirmed that the trouble was not exclusive to inside the stadium.
"We are aware of a number of flares being ignited and thrown on to the pitch at the Emirates stadium," a police spokesperson is quoted to have said by The Guardian. "There were also some flares thrown near to the Tollington Arms on Hornsey Road.
"Police will be reviewing CCTV footage from inside the stadium and of the surrounding streets."
Galatasaray now risk UEFA sanctions as the use of flares is banned in stadiums. In August, 2011, Barcelona were hit with an £87,000 fan after their supporters let off ten flares during a Super Cup game versus FC Porto.
Celtic have also recently been punished for similar incidents.