On ' '' 11 September ' '' ( eleventh anniversary of the September 11 attacks ) , heavy armed Islamist militiamen attacked all the night with rocket-propelled grenades , hand grenades , assault rifles and mortars the US consulate building in Benghazi and a CIA annex , killing four United States citizens , including Ambassador J. Christopher Stevens
September 11 attacks
September 11 attacks
Factional violence in Libya (2011–2014)