By Maha El Dahan and Andrew Mills

DUBAI, Jan 15 (Reuters) - Four Arab states conducted intense diplomacy with the United States and Iran this week to prevent a threatened U.S. attack on Iran over Tehran's use of force against protesters that they feared would have impacts across the region, a Gulf official said.

Saudi Arabia, Qatar, Oman and Egypt were involved in the diplomacy over 48 hours before U.S. President Donald Trump signalled on Thursday that he had ultimately decided against an attack for now, saying the killings in Iran were easing.

The four countries had conveyed to Washington that any attack would have consequences for the wider region in terms of both security and economics that would........

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