Libya unity govt forces enter ISIS bastion

Fighting raged for control of the Islamic State group's Libya stronghold of Sirte after unity government forces battled their way into the centre of the city.

The United States confirmed the advance on Sirte, the hometown of ousted dictator Muammar Gaddhafi that has also been in the sights of forces of a rival authority in eastern Libya.

The loss of Sirte would amount to a huge setback for ISIS, which is also faced with battlefield reverses in Syria and Iraq.