The peacekeeper was wounded when an unidentified armed group fired on an UNMISS patrol that was moving from Gurmuk to Pibor, UN spokesperson Eduardo del Buey told a news conference in New York.

“The peacekeeper has been evacuated to Juba for further medical treatment. His situation is stable,” he stated.

“The Mission strongly condemns this attack against its personnel and calls on all parties to respect the freedom of movement of UN personnel carrying out their mandate and to cooperate with the peacekeepers in their efforts to protect civilians and help establish a stable security environment in Jonglei state.”

Jonglei is the largest state in South Sudan and has been the scene of inter-communal violence since the country became independent from Sudan in July 2011.

The UN Security Council set up UNMISS in July 2011 to consolidate peace and security, and help to establish conditions for development in the world’s youngest nation.

Four Lebanese citizens, and one each from Britain, Greece and Italy, were captured from Nigeria’s northern Bauchi state on February 16. All seven were employees of Setraco, a Lebanese construction company.

The Greek foreign ministry in an announcement said it believes its national is dead.

“The available information suggests that the Greek citizen, who was kidnapped on February 16 by a terrorist organization in Nigeria is dead. The Foreign Ministry has informed his family.”

An Italian foreign ministry statement said: “Our checks conducted in co-ordination with the other countries concerned led us to believe that the news of the killing of the hostages seized last month is true.”

Following reports of the deaths of hostages in Nigeria, the Foreign Secretary, William Hague, said:

This was an act of cold-blooded murder, which I condemn in the strongest terms.

Ansaru issued a communique saying it had killed the hostages because of attempts by Nigerian and British governments to free them.

The group published photos along with the statement that allegedly showed the bodies of all seven victims.

Greece and Italy have both denied the claim that any claim that any government forces attempted to free the hostages.

The Greek foreign ministry also said the “”Based on the information we have, there was no rescue operation nor any contact with the terrorist organization at any stage,” it added.

Ansaru has been linked to several kidnappings, including the May 2011 abductions of a Briton and an Italian working for a construction firm in Kebbi state, near the border with Niger, according to Al Jazeera.