Over the past week, various international bodies have sent out the alarm.

In a statement, the United Nations Support Mission in Libya said it was monitoring "with concern the recent mobilization of forces in various parts of Libya."

The organization, known as UNSMIL, urged "all parties to exercise maximum restraint and avoid any provocative military actions that could be perceived as offensive."

On Thursday, the Delegation of the European Union to Libya expressed similar concerns. "The use of force would harm stability in Libya and lead to human suffering. It should be avoided at all cost," it said in a statement.

Longtime Libya watchers were more direct, suggesting that, after around four years of relative calm in the country, civil war might be about to break out once again.

The warnings came in response to last week's large mobilization of militias affiliated with one of Libya's two rival administrations.

Since 2014, Libya has been split in two, with opposing governments located in the east and west of the country. A UN-backed administration known as the Government of National Unity, or GNU, is based in Tripoli in the west, and its rival, known as the House of Representatives, is based in the east, in Tobruk.

At various times over the last decade, each government has tried — and failed — to wrest control from the other.

The government in eastern Libya is supported by former warlord-turned-politician Khalifa Haftar, who controls various armed groups in his area. It was........

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