Security forces arrested on Thursday twelve anarchist activists on suspicion of attempting to set fire to a field belonging to settlers near the Bat Ayin settlement in Gush Etzion, Ynet reported.The suspects, five Israelis and the rest foreigners, were undergoing interrogation by the police. According to the settlers, this is the third time the field has been ignited in the last three weeks by the same activists.The fire that was started burned about 50 acres of natural groves.