At least eleven people have been reported dead after armed men, including two suicide bombers, attacked Libya's electoral commission headquarters.
According to multiple reports, militants stormed the building in the capital of Tripoli on Wednesday.
The attack appeared aimed at derailing efforts to organise elections in Libya by the end of this year, part of a UN-led attempt to unify and stabilise the country after years of conflict and political division.
Electoral commission spokesman Khaled Omar told Reuters that three officials and four security officers were killed in the attack.
Al Jazeera's Mahmoud Abdelwahed, reporting from Tripoli, quoted the city's director for security as saying two suicide bombers detonated their explosives as security forces confronted them.
Images posted on social media showed smoke billowing from the building.
No one immediately claimed responsibility for the attack in Tripoli.
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"After this attack, I think it is a huge, huge hit to the work of the commission and the institutions that have been cooperating" for the election in Libya, he said.
Observers believe the group might carry out similar attacks to deter Libyans from holding elections.
The commission, which has registered almost 1 million new voters across Libya, said the database wasn't damaged.
US State Department spokesperson Heather Nauert condemned the attack in a statement and said the US is committed to working with the Government of National Accord to deny IS "safe haven in their country".
The government in Tobruk, which is supported by self-proclaimed Libyan national army led by Field Marshall Khalifa Haftar, refuses to recognize the Tripoli-based unity government led by Fayez al-Serraj.
The quartet group which includes the Arab League, African Union, European Union and United Nations had called at their meeting last Sunday for parliamentarian and presidential elections before the end of this year.