Two United Nations peacekeepers were killed and five were seriously injured Tuesday when their vehicle struck a bomb in northern Mali, the UN mission said.
"This morning, an armoured vehicle in a MINUSMA supply convoy hit a mine on the Tessalit-Gao highway," MINUSMA said.
The injured were evacuated after a rapid intervention force was sent to the scene, the mission said in a statement.
"MINUSMA strongly condemns this attack, which may constitute a war crime under international law, and notes with concern the frequent use by terrorist groups of improvised explosive devices to cripple the mission's operations and impede the return to peace and stability," it said.
"Mines and improvised explosive devices in Mali affect UN personnel, Malian defence and security forces and the communities we serve without distinction."
In New York, the UN Security Council also condemned the attack "in the strongest terms" and called on Malian authorities to launch an investigation, reiterating the warning that "attacks targeting peacekeepers may constitute war crimes under international law."
MINUSMA -- the United Nations Multidimensional Integrated Stabilization Mission in Mali -- is one of the UN's biggest peacekeeping operations, and one of its most dangerous.
MINUSMA's full complement includes 13,289 military personnel and 1,920 police.
The force's mandate was extended by the UN Security Council for 12 months on June 29.
However, it will be without French air support, which has been refused by Mali, whose ruling junta is at odds with France.
Jihadists joined a regional insurgency in northern Mali in 2012, and then extended their campaign to the centre of the country and neighbouring Burkina Faso and Niger.
Thousands of civilians have died, more than two million have fled their homes, and economic damage to countries that are among the poorest in the world has been severe.