UN peacekeeper killed in north Mali IED attackSecretary-General Antonio Guterres has condemned the attack on UN peacekeepers in MaliBAMAKO - An Egyptian peacekeeper was killed and four colleagues were seriously injured in improvised explosive attacks on their convoy in Mali's volatile north on Saturday, the United Nations said. Guterres said attacks could constitute war crimes, and called on Malian authorities "to spare no effort" in finding those responsible. "This incident is a sad reminder of the permanent danger hanging over our peacekeepers and of the sacrifices made for peace in Mali," El-Ghassim Wane, who heads the UN mission in Mali (MINUSMA), said in an earlier statement. In April, four Chadian peacekeepers from MINUSMA were killed in a jihadist attack on their camp in Aguelhok, also in northeastern Mali. - Controversy over Russian firm -Mali's new military-dominated government took delivery Saturday of four Russian military helicopters as it considered hiring mercenaries from a Russian private security firm.