"The convoy, comprising 32 Indian soldiers, was attacked and the casualties included 1 Lt Colonel, 1 Junior Commission Officer and 3 jawans. There were also 4 wounded, of which 1 is of officer level."
The attack took place at 0930 hrs local time (12.35 IST).
"The Indian casualties, including the injured (together with other local civilian casualties) are being brought by 3 UN helicopters from Jonglei to Juba," official sources said.
The sources also said India's Ambassador will be meeting with the Special Representative of the UNSG in South Sudan, Hilda Johnson to ascertain further details and to facilitate all arrangements, as necessary.
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There are around 2,200 Indian Army personnel comprising two battalions, one based in Jonglei and the other in Malakkal, Upper Nile, on the border with Sudan.
Since South Sudan got independence in July 2011, it has witnessed ethnic strife, with Pibor county, the main base of UN peacekeeping force, being the centre of much of the violence.
India is a major contributor to UN peacekeeping forces around the world and has suffered losses in the past.