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FILE - In this July 25, 2013, file photo U.S. National Security Adviser Susan Rice is seen at the White House in Washington. Sunday, Feb. 23, 2014, Rice said on NBC's "Meet the Press" that it would be a grave mistake for Russia to intervene militarily in Ukraine. Rice said during that during President Barack Obama's phone conversation Friday with Russian President Vladimir Putin, the two leaders agreed that a political settlement in Kiev should ensure the unity of the country and the right of Ukrainians to express their free will.
WASHINGTON—A senior White House official says the U.S. remains focused on finding those responsible for the Sept. 11, 2012, attack on U.S. diplomatic facilities in Benghazi, Libya, that killed Ambassador Christopher Stevens and three other Americans.

Susan Rice said on NBC's "Meet the Press" on Sunday that the U.S. has "made progress" in the search for the perpetrators, but she did not elaborate. She said U.S. officials are committed to pursuing it until they succeed.

Rice was heavily criticized when she said in a series of talk show appearances five days after the Benghazi attack that it was linked to mob protests over an anti-Islamic film. Al-Qaida-linked militant groups were later blamed for the attacks. At the time she made that statement, Rice was U.S. ambassador to the United Nations.