KHARTOUM, Jan 13 (Reuters) - Two senior U.S. officials have flown in to Sudan to review security at their embassy following the killing of a U.S. aid official in Khartoum, staff said on Sunday.

The U.S. Principal Deputy Assistant Secretary of State for African Affairs Linda Thomas-Greenfield arrived in the capital with the Director General of the U.S. Foreign Service Harry Thomas, officials said.

"First and foremost they are here to talk about security relating to the embassy after what happened," said Walter Braunohler, a spokesman for the U.S. embassy in Sudan.

John Granville, a 33-year-old officer with the U.S. Agency for International Development, was shot and killed while being driven home from New Year's celebrations in Khartoum in the early hours of January 1.

Granville's driver Abdelrahman Abbas Rahama, 39, was also killed in the attack.

The U.S. embassy in Khartoum has refused to comment on whether they suspect Granville was targeted by terrorists.

Sudanese security services said they uncovered a plot to bomb Western interests in Khartoum in August.

Thomas-Greenfield met Sudan's Minister of Foreign Affairs Deng Alor on Saturday and assured him the shooting would not affect their diplomatic relationship, said Braunohler.

The U.S. officials arrived in Khartoum on Friday and were due to leave on Monday, he added. (Writing by Andrew Heavens; Editing by Charles Dick)

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