In Benghazi, Libya, a firefight erupted when a group attack a U.S. diplomatic mission. This fight lasted for hours, and resulted in the deaths of 4 Americans (2 Navy Seals, 1 ambassador, and a CIA operative if I recall correctly). What makes this so important however, is that the government released false information about the incident. We were told that the attack was the result of riots, but there were absolutely no riots at all. With the deaths of 4 Americans, this cover-up is larger than the infamous Watergate Scandal. The government has yet to release the truth.

Information on the Benghazi attack: http://en.wikipedia.org/wiki/Attack_on_the_U.S._diplomatic_mission_in_Benghazi