UNITED NATIONS, June 21 (Reuters) - One medical charity has has treated 500 victims of sexual violence in Darfur in four months and this is just a fraction of such attacks in the Sudanese province, a senior U.N. official said on Tuesday.

Under-Secretary General Jan Egeland told the Security Council women and children were being systematically raped and assaulted in the ravaged region and urged Sudanese authorities to do more to protect civilians and end a culture of impunity.

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