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US Defense Secretary Jim Mattis said the US government was consulted on the decision and that Washington supported the move while continuing to work with the alliance to minimise civilian casualties and expand humanitarian efforts.
Any co-ordinated decision by Washington and Riyadh could be an attempt to forestall action threatened in Congress next week by lawmakers over refuelling operations.
However, a halt to refuelling could have little practical effect on the conflict, seen as a proxy war between Saudi Arabia and Iran. Only a fifth of coalition aircraft require in-air refuelling from the United States, US officials said.
The Sunni Muslim alliance led by Saudi Arabia and the UAE has recently