The home of a Greek referee was on Friday attacked for the second time in two weeks, raising the possibility of a strike by football officials.
The glass entrance door to Angelos Evangelou's home was smashed in an attack which follows an assault on December 22 with firecrackers that caused extensive damage.
Evangelou was the video assistant on December 22 when Olympiakos had a goal disallowed and a penalty appeal ignored as they drew 0-0 at Volos.
The result dropped Olympiakos to second in the table and the 44-time Greek champions lodged a protest about "bad officiating" and filed a lawsuit against the five referees, accusing them of taking bribes.
They have also sent protest letters to football governing bodies UEFA and FIFA, claiming "a deliberate and surgically precise alteration of the outcome of a match in which VAR was used".
After the first attack, league referees called a strike but on Wednesday voted overwhelmingly to suspend the action after receiving assurances from the Greek football federation, the league and clubs.
There was no immediate reaction from the referees after the latest incident, and this weekend's round of Super League fixtures will go ahead with Olympiakos two points behind league leaders PAOK Thessaloniki by two points.
The football federation called the latest attack "unthinkable madness in Greek football."
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