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			 The stepped-up assistance comes as two weeks of relentless air 
			strikes by the Saudis and other Gulf Arab allies have largely failed 
			to halt advances by the Iran-linked Houthi forces. 
			 
			The U.S. officials said the expanded assistance includes sensitive 
			intelligence data that will allow the Saudis to better review the 
			kingdom's targets in fighting that has killed hundreds and displaced 
			tens of thousands since March. 
			 
			"We have opened up the aperture a bit wider with what we are sharing 
			with our Saudi partners," said one U.S. official. 
			 
			"We are helping them get a better sense of the battlefield and the 
			state of play with the Houthi forces. We are also helping identify 
			'no strike' areas they should avoid" to minimize any civilian 
			casualties, the official said. 
			 
			U.S. ally Saudi Arabia is concerned that the violence could spill 
			over the border it shares with Yemen, and is also worried about the 
			influence of Shi'ite Iran, which has denied Saudi allegations it has 
			provided direct military support to the Houthis. 
			 
			The United States, whose fight against al Qaeda militants in Yemen 
			has been dealt a heavy setback by the Houthi takeover of the capital 
			Sanaa and ousting of the previous government, has avoided a direct 
			role in the worsening conflict. It will still stop short of picking 
			targets for the Saudis, said the four U.S. officials, who spoke on 
			condition of anonymity. 
			
			  But Washington has come under pressure to do more to assist the 
			alliance led by Saudi Arabia, which fears the Houthi advance is 
			expanding the influence of arch foe Iran to its border. 
			 
			Saudi concerns of growing Iranian influence have also been 
			heightened by nuclear talks between Tehran and world powers that 
			could result in a deal by June 30 removing punishing sanctions on 
			the country. 
			 
			A senior U.S. diplomat said earlier this week that Washington was 
			speeding up arms supplies and bolstering intelligence sharing with 
			the Saudi-led alliance. The Pentagon has said it is beginning aerial 
			refueling of Arab coalition jets – although outside Yemeni airspace. 
			 
			Until recent days, U.S. intelligence support was limited to 
			examining Saudi targeting information to try to affirm its accuracy, 
			U.S. and Saudi officials said. 
			 
			The U.S. role has now expanded in size and scope, involving more 
			detailed “vetting” of targeting information prepared by the Saudis, 
			with a particular interest in helping the Saudis to avoid civilian 
			casualties, according to the U.S. officials. 
			 
			The White House and Pentagon would not comment specifically when 
			asked about expanded intelligence-sharing. 
			 
			"The United States is providing our partners with necessary and 
			timely intelligence to defend Saudi Arabia and respond to other 
			efforts to support the legitimate government of Yemen," said 
			Alistair Baskey, a White House spokesman.  
			 
			LEGAL BARRIERS 
			 
			Aid groups have said the Saudi strikes, which began March 25, have 
			caused many civilian deaths, including a March 30 attack on a 
			Houthi-controlled refugee camp in northern Yemen that the 
			International Organization for Migration said killed 40 people. 
			Senior Saudi officials have blamed such incidents on the Houthis 
			themselves. 
			 
			The Saudi-led air campaign is aimed at rolling back territorial 
			gains by the Houthis and reinstalling Yemeni President Abd-Rabbu 
			Mansour Hadi, who has fled the country. 
			 
			
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			While the White House announced U.S. intelligence support soon after 
			the operation began, American officials said that data sharing had 
			been extremely minimal in the campaign's early days. That is partly 
			due to legal barriers, the officials said. 
			 
			While the United States has used lethal force against an al Qaeda 
			offshoot in Yemen, it does not consider itself at war with the 
			Houthis. Some officials said the U.S. administration's analysis is 
			that it lacks the ability under international and U.S. law to 
			collaborate with the Saudis in an offensive against the Houthis. 
			 
			Baskey said that U.S. actions were "fully consistent with applicable 
			domestic and international legal requirements." 
			 
			Deputy Secretary of State Antony Blinken spoke in general terms 
			about the expanded cooperation during a Monday visit to Riyadh, 
			without disclosing specifics. 
			 
			"Saudi Arabia is sending a strong message to the Houthis and their 
			allies that they cannot overrun Yemen by force," Blinken said. 
			 
			"As part of that effort, we have expedited weapons deliveries, we 
			have increased our intelligence sharing, and we have established a 
			joint coordination planning cell in the Saudi operation center," he 
			added. 
			 
			The United States has sent a 20-member military coordination team to 
			interact with the Gulf allies, led by Marine Major General Carl 
			Mundy. Assigning a two-star general will facilitate interactions 
			with other high-ranking officials from other nations, U.S. officials 
			said. 
			 
			The United States this week started daily air-to-air refueling 
			flights of fighter jets from Saudi Arabia and the United Arab 
			Emirates. 
			
			
			  
			
			But even with its refueling flights, the United States is exhibiting 
			caution -- carrying out the flights outside Yemeni airspace and 
			requesting financial reimbursement from allies. 
			 
			It is still unclear how the United States plans to accelerate the 
			delivery of bombs and guidance kits to its allies. 
			 
			One person familiar with the matter, speaking on condition of 
			anonymity, said the United States might accelerate shipments to the 
			United Arab Emirates, which could then also help resupply Saudi 
			Arabia. 
			 
			(Editing by Stuart Grudgings) 
			
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