The officials told today that the gunmen carried out the operation overnight.
Four people were killed in the August rocket-propelled grenade attack on the former governor's compound. The former governor and other officials who were present at the time were not hurt.
The officials spoke on condition of anonymity because they were not authorized to talk to reporters.
Yemen has been embroiled in fighting between Shiite rebels and allied army units against forces loyal to the internationally recognized government as well as southern separatists and other militants.
