Good catch. I thought it was just three people too?? Maybe the Turkish diplomat was still there when it started?
http://www.state.gov/r/pa/prs/ps/2012/10/198791.htm
Background Conference Call With Senior State Department Officials
Washington, DC
October 9, 2012
EXCERPT
One special agent immediately goes to get the Ambassador in his bedroom and gets Sean, and the three of them enter the safe haven inside the building.