"The murder of six hostages taken during ISIL's attack on the town of Al-Foqha on October 28 is particularly abhorrent," the mission said in a statement on Tuesday.
"The senseless murders are a serious violation of international humanitarian law and may amount to war crimes," the statement said.
Libyan media reports on Sunday cited authorities in the Jufra region surrounding Al-Foqha as stating that the Islamic State had executed six out of 10 hostages captured in the attack.
The mission also deplored a series of attacks against civilians and facilities in Libya on Sunday and urged the authorities "to take prompt and effective action against the lawlessness engulfing the region".
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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