US Secretary of State Hillary Clinton has said she accepts the findings of an independent panel that faulted the State Department over the deadly September attack on the US mission in Benghazi, Libya. An inquiry into the attack on the US mission, which saw the US ambassador and three other US citizens killed, found that the State Department security arrangements there were “grossly inadequate”. The months-long probe found there had been “no immediate, specific” intelligence of a threat against the mission, which was overrun on September 11 by dozens of heavily armed fighters who killed the four Americans. Clinton also ordered widespread changes to bolster US diplomatic security overseas. She said in a letter to US congressional committees on Tuesday that she had instructed the State Department to implement its findings “quickly and completely” and outlined a series of steps aimed at improving the security of US diplomatic outposts.