June 17 (Reuters) - Major stock markets in the Gulf region were mixed on Wednesday as investors assessed the outcome of the interim agreement between the United States and Iran.

Some details of the agreement emerged on Tuesday, with US President Donald Trump saying the arrangement would prevent Tehran from acquiring a nuclear weapon. A US official indicated that Iran would be allowed to resume oil sales once the agreement is signed on Friday.

The index in Saudi Arabia fell slightly by 0.1 percent, with Aramco shares dropping 0.9 percent.

An order issued by the U.S. Department of Transportation on Tuesday stated that Riyadh Airlines had been granted the right to operate flights to and from the United States.

The index in Dubai rose 0.3 percent, boosted by a 0.8 percent gain in leading real estate developer Emaar Properties.

But the index in Abu Dhabi fell 0.1 percent

The index in Qatar rose 0.3 percent, with shares of Qatar National Bank, the largest bank in the Gulf region, also climbing 0.3 percent.