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Amal Alamuddin, the London-based international law and human rights lawyer who is engaged to George Clooney, turned down an offer from the United Nations to investigate possible war crimes in Gaza.

The UN's Human Rights Council had announced Monday that Alamuddin would serve as part of a three-person commission to "investigate all violations of international humanitarian law and international human rights law in the Occupied Palestinian Territory, including East Jerusalem, particularly in the occupied Gaza Strip, in the context of the military operations conducted since 13 June 2014."

But hours later, ABC News confirmed with UN spokesman Farhan Haq that Alamuddin had pulled out.

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Clooney's rep Stan Rosenfield issued a statement on Alamuddin's behalf saying she declined the UN offer because she was too busy.

"I am horrified by the situation in the occupied Gaza Strip, particularly the civilian casualties that have been caused, and strongly believe that there should be an independent investigation and accountability for crimes that have been committed," the statement said, according to The Guardian.

"I was contacted by the UN about this for the first time this morning. I am honoured to have received the offer, but given existing commitments - including eight ongoing cases - unfortunately could not accept this role. I wish my colleagues who will serve on the commission courage and strength in their endeavors," the statement concluded.

Alamuddin had been expected to work alongside Doudou Diene of Senegal, a lawyer who has held U.N. posts on racism and human rights in Ivory Coast, and Canadian international law professor William Schabas, who will chair the commission.

Clooney, 53, popped the question in April to the British-Lebanese barrister, 36, recently telling Variety, "I'm marrying up."