France is seeking support from European counterparts for joint action in Libya to stem violence and uproot terrorists who have established a foothold there.

Islamist-allied militias have cemented their control over Libya's capital after the worst bout of violence since an international coalition helped rebels oust Libyan dictator Muammar Gaddafi in 2011.

French defence minister Jean-Yves Le Drian is quoted in an interview in Le Figaro as saying "we must act in Libya and mobilise the international community".

He said France could move troops it has from nearby countries towards the Libyan border.

He said he would appeal to European defence ministers meeting in Milan for action, and suggested a similar push at the UN General Assembly later this month.

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