UN calls for probe into migrants' killing in Libya

"I am shocked by the horrific reports about Wednesday's shooting at a smuggling warehouse in Mezda killing 30 migrants and injuring 11 others," UN Humanitarian Coordinator for Libya Yacoub El Hillo said in a statement on Friday.

The incident, which occurred at the town of Mezda, some 180 km southwest of the capital Tripoli, was reportedly a revenge attack carried out by the family of a Libyan smuggler who was murdered by migrants.

"Authorities with influence on the ground in the area where this incident took place have the responsibility to ensure that human smugglers and traffickers are not allowed to continue with their inhuman and degrading acts," the UN official said.

"Such a heinous and merciless crime against helpless individuals should be investigated immediately and those responsible must be brought to justice.

"Those responsible for the attack must be held accountable. The impunity with which smugglers and traffickers operate in Libya must be brought to an immediate stop," he urged.

On Thursday, Libya's UN-backed government confirmed that its Interior Ministry had issued an instruction for Mezda's security directorate to arrest those responsible for the incident.

The UN estimated that more than 654,000 migrants and refugees are living in Libya, and many of them face arbitrary detention, gender-based violence, forced labour, extortion and exploitation.

Smugglers exploited chaos and insecurity in the country to send thousands of migrants through the Mediterranean Sea towards European shores.