The UN Mission in South Sudan (UNMISS) has condemned the killing of one of its staff in the country.

Charles Kiir Gone was serving with the peacekeeping mission in Wau, in the north-west.

He was reportedly killed during an attack by armed men in a relative’s home, where he was staying.

Mr Gone was on leave from work at the time of the attack that has been linked to cattle rustling, according to privately-owned Eye Radio news website.

UNMISS has condoled with the family and has urged authorities to immediately investigate the incident.

In a statement, UNMISS head Nicholas Haysom said the attack "illustrates the real and ongoing threat to the lives of UN peacekeepers supporting South Sudan on its journey towards peace”.

A vicious cycle of cattle raids and reprisal attacks have plagued South Sudan, with thousands killed in recent years.