The PC blamed the eastern Libyan National Army (LNA) forces loyal to Khalifa Haftar for the disgusting crime and urged the United Nations Support Mission in Libya (UNSMIL) to carry out an investigation into these attacks.
An airstrike killed more than 40 people and injured more than 50 others in Murzuq later Sunday, a local official told Xinhua Monday.
The local media reported the attack targeted a wedding procession.
The Tripoli-based internationally recognised government opposing Haftar said dozens were killed and wounded.
The overnight attack in Morzuq, in southern Libya, came as residents were holding a town meeting, Mohamed Omar, a member of the city council, said by phone.
The United Nations did not name the LNA but said the attacks had "continued unabated" since the start of Haftar's offensive on Tripoli.
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The GNA urged the UN's Libya mission and worldwide community "to carry out an investigation into the crimes committed by Haftar's militias in Murzuq".
The LAN said in a statement its strike had targeted "Chadian opposition fighters", as phrase that usually refers to Tebu tribesmen opposing them in the areas.
Last month five doctors were also killed in a similar air strike on a hospital in the southern outskirts of Libya's capital Tripoli.
The air strike adds to a worsened humanitarian situation in the war-torn country.
Since early April, there has been intense fighting between the government and the east-based rebel army, which is trying to take over the capital Tripoli and overthrow the government.
Libya has been mired in conflicts and chaos ever since the fall of former leader Muammar Gaddafi in 2011.