Napoli ultras clashed violently with police inside Leicester's stadium after the teams played out a thrilling 2-2 draw in their Europa League match.
The Foxes were leading the game by two goals when Napoli stormed back to claim a point in the final minutes thanks to a brace from striker Victor Osimhen.
Tempers flared on the pitch in a fractious ending that saw Wilfred Ndidi sent off for Brendan Rodgers' side.
Tensions had been rising between the two sets of fans and dramatically boiled over after the final whistle.