The story

An American diplomat working toward restoring peace in war-torn Sudan was shot and killed along with his driver early Tuesday as he headed home from a New Year's party in the Sudanese capital, his family said.

U.S. officials are working with Sudanese authorities to determine whether it was a targeted attack or an isolated incident.

John Granville, 33, was a U.S. Foreign Service diplomat from Buffalo, New York. Read full article »

CNN's MaryLynn Ryan contributed to this report.

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