TRIPOLI, Aug. 11 (Xinhua) -- Libya's UN-backed government on Sunday accused the rival east-based army of breaking a UN-proposed humanitarian truce in the capital Tripoli by firing rockets on civilian areas.

"The militias of the war criminal Haftar (army commander) broke the truce of Eid al-Adha. They indiscriminately fired rockets at Suk al-Juma area of the capital Tripoli in Eid al-Adha morning and injured three civilians," the government forces said in a statement.

The statement also accused the army of targeting the city's international airport and causing suspension of flights.

Since early April, the government has been engaged in a deadly armed conflict against the army, which is trying to take over the capital Tripoli and overthrow the government.

The fighting so far has killed more than a thousand people, injured more than 5,700 others, and forced more than 120,000 people to flee their homes, according to the World Health Organization (WHO).

On Thursday, the UN Support Mission in Libya (UNSMIL) called for a humanitarian truce on the occasion of the holly Eid al-Adha, on which both parties agreed.

The army is allied with the eastern-based government, as the north African nation is politically divided between eastern and western governments.

Libya has been struggling to make a democratic transition amid insecurity and chaos ever since the fall of former leader Muammar Gaddafi's regime in 2011.