Benjamin Netanyahu, the Israeli prime minister, accused the United Nations Secretary - General of " encouraging terror " after Ban Ki - moon spoke of Palestinian frustration at Israel ' s occupation and said it was natural to resist. "The comments of the UN Secretary-General encourage terror," said Netanyahu in a statement. "There is no justification for terror." Earlier, Ban told the UN Security Council of the "profound sense of alienation and despair driving some Palestinians - especially young people" in the upsurge of attacks on Israelis since the start of October. "Palestinian frustration is growing under the weight of a half century of occupation and the paralysis of the peace process," he said. "As oppressed peoples have demonstrated throughout the ages, it is human nature to react to occupation, which often serves as a potent incubator of hate and extremism." Violence since October 1 has killed 159 Palestinians and 25 Israelis, as well as an American and an Eritrean, according to an AFP count. Ban condemned the Palestinian attacks, but said Israeli settlement building cast doubt on Israel's commitment to the goal of an independent Palestine alongside the Jewish state. "Continued settlement activities are an affront to the Palestinian people and to the international community," he said. "They rightly raise fundamental questions about Israel's commitment to a two-state solution."