A fourth UN peacekeeper in Mali has died as a result of a blast caused by an improvised explosive device.
The UN patrol was checking for landmines in Tessalit in northern Mali when the blast took place on Monday.
All of those who died were from Chad.
About a 180 peacekeepers have been killed during the decade-long UN mission in Mali.
It began in response to a jihadist insurgency, but the violence has persisted and spread.
The head of the mission, El-Ghassim Wane, told a meeting of the UN Security Council in New York that more help was desperately needed.