An Italian journalist in the city has claimed that travelling supporters were ambushed by Swiss fans less than a mile away from the Stadion Letzigrund.
Italian reporter Carlo Alvino called the attack "cowardly".
He wrote on social media: "Cowardly attack on Napoli fans.
"Cars with Italian number-plates surrounded and attacked.
"It wasn’t far from the stadium."
Alvino also said that local police were "slow to react".
Footage shows two groups of supporters rush towards each other in the middle of the road.
A second angle, taken closer to the violence, shows that some fans are armed with weapons – although it is not clear what they are holding.
A flair is also seen being fired towards the group on the right.
The Napoli group, apparently on the left, are far outnumbered and eventually turn and flee when the Zurich fans charge them.
The videos then go dead.
There has so far been no news on whether there were any injuries or arrests from the incident.
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