Libyan media : Retired General Khalifa Haftar leads offensive against Benghazi militants . Offensive against Libyan military forces , but attack not authorized by Tripoli , he says . Acting Prime Minister says unauthorized attack amounts to ` ` coup '' At least 12 killed , 91 injured in in - area fighting , state - run news agency says .
Libyan media : Retired Gen. Khalifa Haftar leads offensive against Benghazi militants . Offensive includes Libyan military forces , but attack not authorized by Tripoli , government says . Acting Prime Minister says unauthorized action amounts to `` coup '' At least 12 killed , 91 injured in Benghazi-area clashes , state-run news agency says .