Police in Thessaloniki have arrested a PAOK fan accused of dumping a crate of fish on the visiting Olympiakos bench, in a stunt that delayed a tense Greek Cup semi-final for more than an hour.

Another six PAOK supporters were arrested during clashes with police before and after Wednesday's match, which PAOK won 1-0 to advance.

The game was repeatedly halted by brawls on the pitch, with three players sent off, while PAOK fans in the stands lit thousands of flares, and several were thrown on the pitch.

Police said Thursday a 34-year-old man covered the Olympiakos bench in several kilograms of anchovies just before the game. Olympiakos' home ground is in Athens' port of Piraeus, and its supporters are nicknamed "anchovies".

PAOK plays Panathinaikos in the final on 26 April.