"One dead and three seriously injured after one of our teams hit an improvised explosive device near Tessalit", close to the Algerian border, the UN peacekeeping mission in Mali, Minusma, said.
"This incident is a sad reminder of the permanent danger hanging over our peacekeepers and of the sacrifices made for peace in Mali", the head of Minusma El-GhassimWane was quoted as saying in a statement.
"Today's cowardly attack only strengthens Minusma's determination to support Mali and its people in their quest for peace and stability," he said.
In April, four Chadian peacekeepers from Minusma were killed in a jihadist attack on their camp in Aguelhok, also in northeastern Mali.
Minusma, deployed in Mali since 2013, is currently the deadliest United Nations peace mission in the world, with 145 killed in hostile acts recorded as of August 31, according to UN statistics.
