Khalifa Haftar-led forces destroyed the headquarters' of the UN-recognised Government of National Accord (GNA) in Tripoli, reported Sputnik.
The Libyan National Army (LNA), which is led by renegade commander Haftar attacked the headquarters on Sunday, LNA press service reported.
Earlier in the day, Haftar announced that Muslim fasting month Ramadan is a month of 'holy war'.
New offensive by Haftar's army in Tripoli is feared to further worsen the situation in the country, which is on the brink of civil war.
More than 200 people have lost their lives and 913 have been wounded ever since clashes erupted last month in the region as LNA's army advanced towards Tripoli.
Libya has been largely divided into two factions ever since the death of its dictator Muammar Gaddafi.
The LNA-backed parliament controls the east of Libya, while the GNA governs Libya's western region from Tripoli.
While the US government has primarily backed the GNA which is led by Prime Minister Fayez al-Sarraj, American diplomats and military officers have maintained contacts with Russia backed Haftar.
Most of the international community has urged for a peaceful resolution to the intense fighting which has ensued in the African nation.
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