Fire, Charlene Lamb, the deputy assistant secretary for international programs.

WASHINGTON (Reuters) - A U.S. security officer twice asked his State Department superiors for more security agents for the American mission in Benghazi months before an attack that killed the U.S. ambassador to Libya and three other Americans, but he got no response.

The officer, Eric Nordstrom, who was based in Tripoli until about two months before the September attack, said a State Department official, Charlene Lamb, wanted to keep the number of U.S. security personnel in Benghazi "artificially low," according to a memo summarizing his comments to a congressional committee that was obtained by Reuters.

Nordstrom also argued for more U.S. security in Libya by citing a chronology of over 200 security incidents there from militia gunfights to bomb attacks between June 2011 and July 2012. Forty-eight of the incidents were in Benghazi.