WASHINGTON (Reuters) - The United States has ordered its non-emergency government personnel in South Sudan to leave the country because of security concerns, the State Department said on Sunday.

Increased violence and political friction in South Sudan threaten its fragile peace process, a United Nations rights body said on Saturday, days after the arrests of several officials allied to the country's vice president.

South Sudanese forces have arrested the petroleum minister and several senior military officials allied with First Vice President Riek Machar, Machar's spokesperson said on Wednesday, jeopardising a peace deal that ended a five-year civil war.

South Sudan’s ruling coalition, the Transitional Government of National Unity (TGNoU) had been a loose arrangement meant to patch up peace in the country.

As global temperatures continue to rise, similar extreme heat waves in February could occur once every 10 years, according to the study. And if warming doubles by the end of the century, similar heat waves could occur annually. High temperatures are forecast to continue in the region through March.

Sudan’s Minister of Minerals, Mohamed Bashir Abunommo, accused South Sudan on Saturday of allowing the United Arab Emirates (UAE) to establish an “aggression base” under the guise of a field hospital in Eastern Aweil.

South Sudanese soldiers have surrounded Vice President Riek Machar’s home in the capital and several of his allies were arrested after an armed group allied to him overrun an army base