Two foreign UN workers were shot dead on Monday at an airport in Galkayo, central Somalia, officials and witnesses said.
A United Nations source confirmed the pair were international staff members with the United Nations Office on Drugs and Crime (UNODC).
"Two white men have been shot inside the airport as they got off a plane," local security official Mohamed Mire said. An airport official said the attacker was dressed in a police uniform.
"One of them died inside the airport and the other one was rushed to hospital where he later died of the injuries. Both of them were white men," said witness Hassan Ahmed.
Galkayo is situated 575 kilometres (370 miles) north of the capital Mogadishu and lies on the border with the northern breakaway state of Puntland.