The head of Libya's UN-backed government has accused renegade General Khalifa Haftar of betrayal over his military offensive on the capital.

Prime Minister Fayez Al Sarraj says his forces will confront Haftar's troops with determination.

The two sides have been locked in fierce battles about 30 kilometres from the centre of Tripoli.

Al Jazeera's Mahmoud Abdelwahed reports from Tripoli.

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