Netherlands, New Zealand, Nigeria, Norway, Oman, Papua New Guinea, Paraguay, Peru, Poland, Republic of Korea, Romania, Russian Federation, Rwanda, Senegal, Sri Lanka, Sweden, Switzerland, Timor-Leste, Togo, Uganda, Ukraine, United Kingdom, United Republic of Tanzania, United States, Vietnam, Yemen, Zambia and Zimbabwe. Police have been contributed by Algeria, Argentina, Bangladesh, Bosnia and Herzegovina, Brazil, Canada, China, El Salvador, Ethiopia, Fiji, Finland, Gabon, Gambia, Germany, Ghana, India, Kenya, Kyrgyzstan, Malaysia, Namibia, Nepal, Netherlands, Nigeria, Norway, Oman, Panama, Philippines, Russian Federation, Rwanda, Samoa, Senegal, Sierra Leone, South Africa, Sri Lanka, Sweden, Switzerland, Thailand, Turkey, Uganda, Ukraine, United States, Zambia and Zimbabwe. History 2012 In a July 2012 speech, a day after the extension of the mission, Hilde F. Johnson spoke in Juba about the progress of UNMISS. Johnson discussed the mission's protection of civilians and the documenting and verification of incidents. Johnson discussed the January 2012 Lou Nuer attacks in Jonglei State whereby the actions of UNMISS in deploying peacekeepers and alerting the South Sudanese government resulted in "thousands of civilian lives [being] saved", as well as progress in areas such as policing, justice and democracy. On 21 December 2012, a civilian UNMISS helicopter was shot down over Jonglei State. Five people, including four Russian crewmembers, on board the aircraft were killed. 2013 On 9 April, five Indian UNMISS troops and seven civilian UN employees (two UN staff and five contractors) were killed in a rebel ambush in Jonglei while escorting a UN convoy between Pibor and Bor. Nine further UN employees, both military and civilian, were wounded and some remain missing. Four of the civilians killed were Kenyan contractors working to drill water boreholes. One of the dead soldiers was a lieutenant-colonel and one of the wounded was a captain. According to South Sudan's military spokesman, the convoy was attacked by David Yau Yau's rebel forces that they believe are supported by the Sudanese government. UNMISS said that 200 armed men were involved in the attack and that their convoy was escorted by 32 Indian UN peacekeepers. The attackers were equipped with rocket propelled grenades. A UN spokesman said that the fierce resistance put up by Indian peacekeepers forced the rebels to withdraw and saved the lives of many of the civilians. UN Secretary-General Ban Ki-moon called the killings a war crime, and called for the perpetrators to be brought to justice. United Nations Assistant Secretary-General Anthony Banbury praised the bravery of