An apparently off-duty police officer was arrested on Saturday for participating in a hooligan attack on fellow-officers in violence ahead of the soccer Cup Final. Police said the suspect was among a group of Panathinaikos fans who assaulted police during a brief fracas outside the Nea Smyrni stadium in southern Athens, where Panathinaikos beat Olympiakos Piraeus 3-1 to win its 16th cup trophy, the first since 1994. Some 2,500 uniformed police were on duty to prevent riots during the high-tension match between Greece’s two top clubs, and on the whole managed to keep the peace. Apart from their colleague, police only had to arrest one other man who tried to smuggle fireworks into the stands. Panathinaikos, two points ahead of Olympiakos in the league, had a relatively easy night, scoring their first goal three minutes into the game. Olympiakos equalized 20 minutes into the second half, before letting in two more goals.