The U.S. diplomatic post in Benghazi, Libya, was operating under a lower security standard than a typical consulate when it was attacked this month, according to State Department officials.

The mission was a rented villa and considered a temporary facility by the agency, which allowed a waiver that permitted fewer guards and security measures than a standard embassy or consulate, according to the officials. …

Allowing a waiver would have been a decision made with input from Washington, Libyan officials and the ambassador, according to diplomatic security experts.