Via Washington Post:

Four U.S. military personnel were detained for several hours by Libyan authorities on Friday while they were examining potential evacuation routes for diplomats, in an incident that underscored the danger that American officials continue to face in the North African country.

Shortly before midnight, the State Department confirmed the four men had been released. “We are still trying to ascertain the facts of the incident,” State Department spokeswoman Jen Psaki said. She added that the personnel were working on “security preparedness efforts when they were taken into custody.”

U.S. officials provided few details about the circumstances that led to the men’s detention or how their release was brokered.

The detention came to light after photos of the biographical page of two American men described as Libyan government detainees were posted on social media. Another photo, of blue U.S. Embassy badges with matching names, was circulated on Twitter. A third photo posted on social media showed the men sitting on a torn-up black sofa, looking dour.