A Malian military source, confirming the attack, said reinforcements had been sent to bolster security in the town, he added.
A separate attack took place against MINUSMA in Douenza, around 130 miles south of Timbuktu on Monday, killing one peacekeeper and one Malian national soldier, according to the agency. The peacekeepers have responded and two assailants have been killed.
The UN secretary-general's office released a statement condemning the attacks, saying that "attacks targeting United Nations peacekeepers may constitute war crimes under worldwide law".
In Douentza, MINUSMA said a group of attackers fired on a United Nations camp from an adjacent hill and Malian troops returned fire.
The secretary-general stressed that attacks targeting United Nations peacekeepers may constitute war crimes under worldwide law, Guterres' deputy spokesman Farhan Haq said in a statement.
The U.N. says that unidentified gunmen attacked the U.N. headquarters in Timbuktu, Mali, killing security guards and at least one U.N. peacekeeper.
The UN peacekeeping mission in Mali is the deadliest of its 16 global peacekeeping operations.
The attack in Mali took place two days after a terror attack in Ouagadougou, the capital of Burkina Faso where Gunmen killed almost 20 people and wounded several others during an overnight attack on a restaurant.
The attacks are just ahead of today's session of the Security Council for Peace and Security in Africa.
The members of the Security Council commended the efforts of the region, including through the development of a G5 Sahel Joint Force, in order to address the transnational dimension of the terrorist threat in the Sahel region, and encouraged further progress in this regard. "This is a terrorist attack", Communications Minister Remi Dandjinou said of the attack during a conference on Monday.
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