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As South Sudan prepares to mark four years since seceding from Sudan, there are warnings of a potentially disastrous humanitarian crisis on the horizon.

This as the violent power struggle between President Salva Kiir and rebel leader Riek Machar continues.

Two million people have already been displaced over the past eighteen months.

Aid workers warn the country is on the verge of major food shortages as fighting has disrupted a crucial planting season.

South Sudan’s military on Tuesday dismissed claims that the government has lost control of oil fields in Unity and Upper Nile States to rebel forces. The country’s oil fields have become a battleground and output has been slashed by at least a third.