THE United Nations said three peacekeepers from Chad were killed and four others seriously injured Sunday in attacks against a U.N. convoy in northern Mali using improvised explosive devices.

U.N. spokesman Stephane Dujarric said Secretary-General Antonio Guterres condemned the attacks near Aguelhok in the Kidal region, which may constitute war crimes under international law.

The secretary-general calls on Malian authorities “to spare no effort in identifying the perpetrators of these attacks so that they can be brought to justice swiftly,” Dujarric said.

The U.N. peacekeeping mission in Mali was established in 2013 to help stabilize the northwestern African nation.

Dujarric said: “The secretary-general reaffirms that such cowardly acts will not deter the United Nations from its resolve to continue supporting the people and Government of Mali in their pursuit of peace and stability.”

Despite a 2015 peace agreement between the government and one-time separatists, Kidal has not escaped violence. Jihadists have repeatedly targeted the U.N. base there, and a 2016 attack killed seven peacekeepers.(SD-Agencies)