Wednesday's Champions League match between Roma and CSKA Moscow was briefly suspended in the second half due to fan violence.
With Roma leading 5-0, CSKA supporters began throwing flares at Roma fans and riot police had to intervene.
The match was stopped for approximately two minutes in 71st before it resumed with police taking control from the stadium officials.
There were also reports of skirmishes between opposing fans outside the stadium before kick-off.
CSKA pulled a goal back with the match...
Wednesday night saw AS Roma complete a memorable European night in their Group E clash with CSKA Moscow; Gervinho scored twice as the Serie A side took a 4-0 lead inside 31 minutes and cruised to an eventual 5-1 win.
Yet it could have turned out so differently had CSKA striker Seydou Doumbia taken his one-on-one chance early on. With the Russians reeling at 2-0 down, the Ivorian sprinted clear and had just the goalkeeper to beat ... we'll let the video take it from here (U.S. only).