South Sudanese authorities are holding up United Nations fuel tankers over a tax dispute, jeopardising the delivery of millions of dollars of aid during a humanitarian crisis, the U.N. mission there said.

Tax impositions are preventing United Nations fuel tankers from delivering aid in South Sudan. United Nations fuel tankers are being obstructed by South Sudanese authorities due to a tax dispute, posing a threat to the delivery of millions of dollars worth of aid amidst a humanitarian crisis, the U.N. mission in the country has disclosed.

Move comes after the US, EU, UK and others expressed concerns about Juba's decision to impose taxes on some commodities purchased by the UN

Even as three-quarters of South Sudan’s people face starvation, a squabble between the government and the UN over import taxes is leaving vital aid trucks stuck at the border.