The United Nations Support Mission in Libya (UNSMIL) has expressed its strong condemnation of the violence, intimidation and obstruction to the work of Libya’s sovereign institutions by what it described as militiamen.

The UNSMIL said in a statement on Sunday that members of brigades nominally acting under the Ministry of Interior of the "Government of National Accord" are attacking sovereign institutions and preventing them from being able to operate effectively.

"Interference with sovereign institutions and with Libya’s national wealth is a grave matter and must stop immediately." The UNSMIL remarked.

The UNSMIL also called on the Presidential Council's government to take the steps necessary to prosecute those responsible for these criminal actions.

"The United Nations will report to the international community and work with all of the competent authorities to investigate the possibility of bringing sanctions against those interfering with or threatening the operations of any sovereign institution which works for the good of Libya and the Libyan people." The statement warned.

The statement came after a meeting for the Deputy Special Representative of the Secretary-General for Political Affairs, Stephanie Williams with the Chairman of the National Oil Corporation Mustafa Sanalllah in Tripoli, where Williams expressed the UN’s unrelenting support for the independence of the NOC and the rejection of any threats made against NOC and its staff.

Earlier, the Libyan Investment Authority said it had to change its headquarters after threats by gunmen who asked officials not to comply with orders coming from the Presidential Council.