Sheikh Tamim bin Hamad Al Thani, the Emir of Qatar, met here this evening with Ban Ki-moon, the Secretary General of the United Nations, who is currently visiting the State of Qatar. The Qatari News Agency, which carried the news, said Sheikh Tamim Al Thani underscored during the meeting the importance of taking an expedited world move to stop the war crimes committed by Israel against Palestinians, calling on the world community to undertake their ethical and legal responsibilities to put an end to the siege against Gaza Strip to enable the Palestinian people live in dignity and warning that, had the world community failed to end the Israeli crimes a huge humanitarian catastrophe would have erupted.