The External Affairs Ministry said "every step" is being taken to ensure the safety and security of Indian nationals and that the situation in that country continues to be volatile.
In a series of tweets, External Affairs Minister Sushma Swaraj today said, "South Sudan - I am aware of the developments in South Sudan. We are planning evacuation of Indian nationals.
In a statement, the MEA said, "We are closely monitoring the situation in South Sudan. Necessary advisories for our nationals have been issued. The situation continues to be volatile.
"We are making constant assessments. Our first priority is the security of our citizens. Every step is being taken to ensure the safety and security of our nationals."
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In its latest advisory, MEA said Indian nationals desirous of departing for South Sudan may kindly register themselves at the email ID controlroomjuba@gmail.Com.
In case of absence of Internet, please text to +211955589611, +211925502025, +211956942720, +211955318587, it added.
"The security situation in Juba, the capital city of South Sudan, has deteriorated since July 7, 2016. We have reports of gun fire and fighting on the streets of Juba making any movement virtually impossible.
"Ministry of External Affairs advises all Indian nationals against all travel to South Sudan till situation improves," the MEA advisory said.
"The Indian embassy is in regular touch with concerned authorities in India and all options are being considered for providing relief to Indians stranded here in Juba. All are requested to keep calm and await further development and further inputs from the embassy," the advisory said.
According to official data, there are a few hundred Indians in South Sudan. Some of them have set up businesses in Juba and others are working for various companies. A small number of Indian nationals also work in Christian missionary organisations in that country.