SALEM (AFP) - Palestinians said that Israeli settlers in the occupied West Bank burned about 200 of their olive trees on Sunday and also torched surrounding grazing land. The alleged attackers were seen heading in the direction of the nearby Elon Moreh settlement after setting fire to the trees on land owned by the Palestinian village of Salem, village council spokesman Adli Ishtayeh said. He said that the trees were on ground adjoining the settlement and, for reasons of Israeli security, kept off limits to their owners for most of the time. He said that the Israeli army, which polices the area, had been notified. A military spokesman said no complaint against the settlers had been made and that troops on the scene were treating the incident as a fire, not arson after unseasonably hot and dry weather. A senior Israeli intelligence officer acknowledged that there had been acts of violence and vandalism by Jews in the West Bank, noting in particular recent attacks against mosques there. We are not happy about the situation connected with Jewish extremists in the West Bank, he told a group of foreign journalists on Sunday, speaking on condition of anonymity. It needs big efforts in order to stop this wave of violence. We know who are these people. Hopefully we will be able to stop this wave of violence, he added.