The Libyan capital's sole functioning airport came under renewed fire Sunday, as fighting broke out hours after the UN mission in the country condemned ongoing violations of an arms embargo.

United Nations Support Mission in Libya (UNSMIL) said the attack resulted in the injury of at least two civilians, damaged the tarmac and a number of buildings including private and public property, according to a statement posted by the UNSMIL on Twitter.

The attack came one day after the UNSMIL warned that several countries violated the arms embargo in Libya. Numerous cargos and other flights have been observed landing at Libyan airports in the western and eastern parts of the country, providing the parties with advanced weapons, armored vehicles, advisers and fighters, according to the mission. 

On Sunday, Germany's foreign ministry backed the UNSMIL statement and voiced concerns about "a series of unconfirmed but credible reports of embargo violations on both sides." 

Read more: UN warns countries have breached arms embargo agreed at Libya summit

In another sign that a shaky truce was faltering, eastern Libyan military commander Khalifa Haftar sought on Sunday to open a new front by moving forces towards the city of Misrata, which is allied to the country's internationally recognized government, Government of National Accord.

The UN is hoping to hold inter-Libyan talks soon in Geneva to consolidate the sagging truce, as its mission in the country warns of a renewed and intensified round of fighting. 

(With input from agencies)