GENEVA - Arab countries proposed on Friday extending the mandate of UN investigators documenting war crimes in Syria and said that more experts were needed for the growing task.

A draft resolution submitted to the United Nations Human Rights Council by a group of Arab states, backed by Western powers, calls for the investigations to carry on for the next six months.

The UN body launched the commission in August 2011 after a majority of member states out-voted four countries that opposed it, including Russia and China.

Its current mandate expires at the end of the Council's three-week session next Friday, on Sept. 28 by which time the vote on extending the mandate should have take place.

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