A South Sudanese government soldier chants in celebration after government forces on Friday retook from rebel forces the provincial capital of Bentiu, in Unity State, South Sudan, Sunday, Jan 12, 2014. On Sunday senior South Sudanese government officers inspected the recaptured town of Bentiu, in northern Unity State, that was the scene of intense fighting between government and rebel forces, while a South Sudanese government official claimed rebels had badly damaged petroleum facilities in the state.

The United States condemned intense fighting in war-wracked South Sudan, where government forces recaptured a key rebel enclave after a weeks-long assault marred by accusations of rights abuses.

The government assault that began in late April is one of the heaviest offensives in South Sudan’s 17-month-long civil war, which has cut off over 650,000 people from aid.

“The United States condemns the intensified fighting and violence in Unity, Upper Nile, and Jonglei states in South Sudan,” a statement from State Department spokeswoman Marie Harf said late Wednesday.

The U.S. also warned against humanitarian violations, following reports by the United Nations and aid agencies of gunmen raping women and children, torching towns and looting relief supplies.

“The outright targeting of civilians already vulnerable to greater harm, especially women and children, and grave human rights abuses and violations of international humanitarian law by all sides are unacceptable.”

“The international community will hold those who perpetrate such abuses and violations to account.”

South Sudan’s conflict broke out in December 2013 after President Salva Kiir accused his former deputy Riek Machar of attempting a coup.

Leer is the birthplace of Machar. It was ransacked by government forces in January 2014, with gunmen looting and torching the hospital there run by Doctors without Borders (MSF).

MSF has since rebuilt the hospital, the only facility of its type in opposition-held areas.

The U.S. statement also called for a ceasefire and open access for the U.N. and aid agencies to investigate alleged rights abuses and help affected people.

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