Amal Alamuddin, a Lebanese-born British lawyer and fiancee to Hollywood actor George Clooney, was appointed as one of three top experts to an inquiry commission by the United Nations which will investigate Israel's offensive on Gaza last month, according to The News International.

But she later declined the post, according to Reuters.

"I am honoured to have received the offer, but given existing commitments -- including eight ongoing cases -- unfortunately could not accept this role," she said in a statement.

The other two experts are Doudou Diene of Senegal, who was a U.N. watchdog on racism and on post-conflict Ivory Coast, and William Schabas, a Canadian international lawyer.

Israel was accused of committing crimes in violation of international law during its attack on Gaza in July, and the U.N. voted to create the commission -- with opposition from the U.S. and Israel -- on July 23, according to The News International.

A statement from the U.N. said that the panel will investigate "all violations of international humanitarian law and international human rights law ... in the context of the military operations conducted since 13 June 2014," Reuters reported.

A full report on the findings is due by March 2015.

The Israel offensive killed more than 1,900 Palestinians, while Israels suffered the loss of 67, according to Reuters.

Navi Pillay, a top U.N. human rights official, said on July 31 she believed Israel was deliberately defying the Geneva Convention -- by bombing homes, schools, hospitals and the sole power plant in the region.

Hamas is also accused of violating laws by firing without discrimination into Israel, but no panel has been called to investigate, which has resulted in bitter comments from Israel.

In a statement, Israeli Foreign Ministry spokesman Yigal Palmor said, "the Human Rights Council had long ago turned into the 'terrorist rights council' and a kangaroo court, whose 'investigations' are pre-determined."

Hamas, on the other hand, welcomed the inquiry.

Spokesman Sami Abu Zuhri in Gaza said "Hamas welcomes the decision to form an investigation committee into the warcrimes committed by the occupation (Israel) against Gaza and it urges that it begin work as soon as possible."