Passage: Israeli police and the army supported by helicopters combed the area, as the investigation focused on an attack by Palestinian nationalists while not ruling out rather a criminal act. The security forces have warned against attacks by Palestinian militants to coincide with this week's Jewish Passover holidays. Question: What event has already finished? Events: ['supported', 'combed', 'investigation', 'attack', 'ruling', 'warned', 'attacks', 'coincide', 'holidays']
supported combed investigation attack ruling warned