By Rachel Huggins - 12/28/13 07:48 AM EST
Four U.S. military personnel investigating potential evacuation routes in Libya were briefly detained and released Friday, according to the Associated Press.
"We are still trying to ascertain the facts of the incident," Psaki added.
No one was injured. The four were supporting U.S. Marine security forces protecting the American Embassy when an altercation took place at the checkpoint, a Defense Department official said.