Photos: Galatasaray fans throw flares onto the pitch during Arsenal clash

Riot police were ordered into position in front of Galatasaray after flares were hurled on to the pitch in the first half of Wednesday night's Champions League tie against Arsenal.

Several flares were thrown on to the Emirates Stadium turf after defender Felipe Melo had performed a two-footed tackle on Alexis Sanchez in the 36th minute.

Arsenal led 2-0 at the time following two goals from Danny Welbeck.