From the Nov. 8, 2013 Congressional Research Service report: Securing U.S. Diplomatic Facilities and Personnel Abroad:
The United States maintains about 285 diplomatic facilities worldwide. Attacks on such facilities, and on U.S. diplomatic personnel, are not infrequent. The deaths of Ambassador Christopher Stevens and three other U.S. personnel in Benghazi, Libya on September 11, 2012, along with attacks on U.S. embassies in Egypt, Sudan, Tunisia, and Yemen, drew renewed attention to the challenges facing U.S. diplomats abroad, as well as to the difficulty in balancing concerns for their security against the outreach required of their mission. Congress plays a key role in shaping the response to these challenges, such as by providing resources for diplomatic security and examining security breaches overseas.