UN Secretary General Ban Ki-moon has warned that the future of Libya, and the stability of the whole Sahel region, is at stake as it faces the "terrifying threat" of ISIL.

UN Secretary General Ban Ki-moon has warned that the future of Libya, and the stability of the whole Sahel region, is at stake as it faces the "terrifying threat" of the Takfiri group, ISIL (so-called Islamic State in Iraq and Levant).

But he warned international powers not to "stoke the fires of conflict" in the country.

Ban left Mauritania on Saturday and headed to Algeria as part of a tour of West and North Africa.

While meeting Mauritanian leaders, including President Mohamed Ould Abdel Aziz and Prime Minister Yahya Ould Hademine, in the capital Nouakchott on Friday he said he was "deeply concerned about the situation in Libya".

Chaos has engulfed Libya since the 2011 NATO-backed ouster of dictator Moamer Kadhafi and rival administrations are being urged to sign up to a UN-brokered national unity government to help restore stability.

The internationally recognized government is based in the far east of the North African country.

The ISIL group and other extremist organizations have exploited the power vacuum, making gains along the oil-rich coastal regions and triggering concern among Western nations over Takfiris controlling territory just 300 kilometers (185 miles) from Europe.

"There are alarming reports of widespread human rights violations, including serious abuses that may amount to war crimes," Ban said in his comments Friday.

"All those with influence must use it to calm the situation and stop the fighting. It is utterly irresponsible for any outside player to stoke the fires," he added.

Ban said that his special representative Martin Kobler "is facilitating talks on a national unity government" as "we face the terrifying scourge of Daesh (ISIL) expanding in Libya and beyond its borders."

Delays would only worsen the dire humanitarian needs, he warned, adding that "Libya's future is at stake" and "the reverberations echo far".

Success in stabilizing Libya would also benefit the whole Sahel region and "our world" in general, he added .

The UN chief also called for Mauritania's help in a territorial dispute between Morocco and a Western Sahara separatist group that has displaced tens of thousands in decades of fighting.