President Mahmoud Abbas on Sunday called on UN Chief Ban Ki-Moon  to form an international committee to investigate Israeli crimes committed against Palestinians, media reported.The official Palestinian Authority news agency Wafa said that Abbas gave Robert Serry, the UN special coordinator for Mideast peace, a letter to deliver to Ki-Moon on the subject."Mohammad Abu Khdeir was burnt alive. Sixteen Palestinians, including children and women were killed during the past two weeks, aside from the ongoing kidnapping attempts and assaults against children ," Abbas said, according the Wafa report."We all saw through the media the face of Tarek Abu Khdeir  distorted with injuries by" Israeli police, he added."We are preparing for a set of steps to deter the Israeli aggression and curb settlers' crimes and the ongoing attacks against our people in the besieged Gaza Strip."The President's remarks come as tensions soar amid riots by Palestinians in protest over the killing of 16-year-old Muhammad Abu Khdeir on Wednesday. Abu Khdeir's murder is assumed to have been perpetrated by Jewish extremists angry about the recent killing of three Israelis in the West Bank.