Members of the Third Force militia loyal to the UN-backed Government of National Accord in Tripoli attacked the base used by Khalifa Haftar's self-proclaimed Libyan National Army (LNA) on Thursday.
The UN has condemned the latest challenge to the authority of government, warning it would sow further disorder in the country.
Humanitarian conditions are continuing to deteriorate in Libya five years after the start of the Arab Spring.
Tripoli government withdraws support for Libya's new UN-backed unity government just one day after making promise to cede power
Libya's UN-backed unity government gets major boost after Tripoli administration cedes power
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