The supporters involved missed most of the first half of the 1-0 victory over CSKA, said Chelsea on their official website.
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minute as the London club qualified for the knockout round of the Champions League with two matches still to play.
Chelsea have collected a maximum 12 points from four matches in Group H, eight ahead of CSKA and Paris St Germain, who held champions Porto to a 0-0 draw in Portugal on Tuesday.