One of U.S. President Barack Obama's top Middle East advisers is leaving the administration.
The White House said Dennis Ross has decided to step down from his post.
White House press secretary Jay Carney said Ross had planned to serve just two years in the administration, but extended his commitment by a year to work on the developments in the Middle East during the Arab Spring democracy push.
Ross has served on Obama's National Security Council overseeing the Middle East and the Gulf.
compiled from agency reports