RAMALLAH, West Bank, December 26 (Reuters) - An aide to Palestinian President Mahmoud Abbas condemned Israel"s killing of six Palestinians on Saturday and said the Jewish state is escalating the violence. Nabil Abu Rdainah, the aide, told Reuters that "this grave Israeli escalation shows Israel is not interested in peace and is trying to explode the situation." "Israel is torpedoing international and American efforts to restart peace talks," which stalled a year ago, Rdainah said.--SPA 11:45 LOCAL TIME 08:45 GMT www.spa.gov.sa/731736