US secretary of state Antony Blinken is warning that an all out Israeli attack on the city of Rafah in southern Gaza would provoke "anarchy" without eliminating Hamas.
It is his latest attempt at preventing Israel from carrying out a ground assault.
An Israeli bombardment in the eastern parts of Rafah has already displaced tens of thousands of Palestinians.
Speaking to CBS News Mr Blinken said, "As we look at Rafah, they may go in and have some initial success, but potentially at a very high cost."
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