U.S. Ambassador to Libya John Christopher Stevens and three other Americans were killed Tuesday, September 11 when suspected Libyan religious extremists stormed the U.S. consulate in Benghazi, The Washington Post reported. Libyan officials spent the night in a manhunt trying to find those responsible for the killings which occurred when an angry and armed mob attacked the diplomatic facility in an apparent protest against an anti-Islamic video. Stevens, 52, and the others were fleeing the consulate when a rocket-propelled grenade struck their vehicle. In a statement issued by the White House Wednesday morning, President Obama said he had directed an increase in security at U.S. diplomatic posts around the world. “We condemn this vicious and violent attack that took their lives, which they had committed to helping the Libyan people reach for a better future,” Secretary of State Hillary Clinton said in a statement.