Police have warned fans about the dangers of setting off flares and pyrotechnics inside football grounds as they continue to investigate incidents in Saturday's game between Chelsea and Crystal Palace at Stamford Bridge.
The Metropolitan Police's Central Football Unit and the Football Association are reviewing footage after several flares, smoke bombs and "thunderflash" pyrotechnics were set off in the away end.
Five people were arrested, two of them for possession of a flare.
Officers also recovered a number of flares and pyrotechnic devices found hidden inside toilets at the stadium and a rucksack full of pyrotechnics discovered in nearby Brompton Cemetery.