The chairman of Pakistan Tehreek-i-Insaf (PTI), Imran Khan wrote a letter to the secretary general of the United Nations (UN), Ban Ki-moon, condemning Israeli aggression on Palestinians and urging the UN to play its role on the issue - ARY News reports. Addressing the UN secretary general, the PTI chief said that hundreds of Palestinians are being torn down by the Israeli forces, during the holy month of Ramazan and the UN has been playing silent spectator's role.