Secretary of State Hillary Clinton has tonight taken part in a traditional gathering at the State Department to celebrate the end of Ramadan.
"No matter how belated we are honouring Eid and the end of Ramadan, this is a cherished tradition here at the State Department and I would like to thank all of you for being here including the many members of the diplomatic corps.
"Tonight our gathering is more sombre than any of us would like. This comes during sad and difficult days for the State Department family. We lost four Americans, they were good and brave men.
"They were committed to the cause of building a brighter future for the people of Libya and we condemn the violence in the strongest terms. Violence against our posts in Benghazi, in Egypt and now in Yemen."
President Obama vowed to do everything possible to protect Americans overseas as he honoured the four killed in the Libyan consulate attack.
Both Barack Obama and Mitt Romney know how they respond to the spread of violence across the Arab world could affect their election hopes.
Mitt Romney has attempted to score cheap, tawdry political points in the wake of the worst attack on the US diplomatic service in decades.