NATO Chief Jens Stoltenberg said Tuesday the bloc was concerned over reports of mass graves in Tarhouna, calling for a UN investigation into such violations in Libya.

Stoltenberg said NATO was also concerned about the increased Russian presence in the eastern Mediterranean in general; in Syria and in Libya.

He said the situation in Libya was not on the meeting agenda, but could be discussed, adding: “It has a direct impact on the security of especially our southern allies, but actually for the whole of NATO.”

Meanwhile, the European Union called for an independent investigation to be launched into mass killings by Khalifa Haftar’s forces after more than 100 bodies were discovered in Tarhouna after liberation.

“The reported discovery of eight mass graves around Tarhuna in northwestern Libya is profoundly disturbing,” EU Foreign Affairs High Representative Josep Borrell said in a statement Tuesday.

Borrell added that an immediate independent probe needs to be launched to verify the findings and bring the perpetrators to justice.

“The EU reminds all parties to the conflict in Libya of their obligations, under international humanitarian law and international human rights law, to protect the civilians and civilian infrastructure,” the statement reads.