Three United Nations soldiers from Bangladesh were killed by an explosive device that detonated as they were escorting a convoy in northern Mali on Sunday, the West African country's peacekeeping mission and Bangladesh's military said.

Attacks on peacekeepers in Mali, where Islamist groups continue to operate in the vast desert in the north of the country, have made the U.N. mission there, MINUSMA, the organization's deadliest.

Another five U.N. troops were seriously wounded in Sunday's explosion, which occurred at around 7 a.m. (0700 GMT) on the main road between the towns of Anefis and Gao, MINUSMA said in a statement.