Both sides claim the other breached the truce after it came into effect
South Sudan cease-fire violated within hours
South Sudan government troops violated the country's latest cease-fire just hours after it began at midnight, the armed opposition claimed Saturday, while a government spokesman accused the rebels of attacking instead.
The competing claims indicated a shaky start to the latest attempt at ending the country's devastating five-year civil war, which has killed tens of thousands and created Africa's largest refugee crisis since the 1994 Rwandan genocide. Millions are near famine and aid delivery is often blocked in one of the world's most dangerous countries for humanitarian workers.
President Salva Kiir and rival Riek Machar, Mr Kiir's former deputy, had agreed on the "permanent" cease-fire earlier in the week in neighboring Sudan after their first face-to-face talks in nearly two years. They then ordered their supporters to observe it.
Opposition spokesman Lam Paul Gabriel said government forces and Sudanese rebel militias launched a "heavy joint attack" in Mboro, Wau County in the northwest around 7 a.m. Saturday, arriving in armored personnel carriers, trucks and Land Cruisers.
"The fight is still ongoing as I write," Mr Gabriel said, calling on the UN peacekeeping mission and cease-fire monitors to investigate. The opposition reserved the right to self-defense, he added.
"This is disappointing that even when their president and commander-in-chief Salva Kiir declares a cease-fire, the regime's forces still violate it," Mr Gabriel told The Associated Press. "There is the possibility Salva Kiir is not in control of his forces or he doesn't want peace to come."
South Sudan government spokesman Ateny Wek Ateny told the AP that the opposition attacked instead.
"They have a loose leadership; they're not being controlled by anyone. The people of South Sudan should be given a chance to lead a peaceful life, and the army is observing the order of the president. It's very sad," Mr Ateny said.
The previous cease-fire in December was violated within hours, prompting a new push by the international community to threaten UN and regional sanctions against those blocking the path to peace.
This time, Mr Kiir and Mr Machar had faced a possible UN arms embargo and sanctions if fighting didn't stop and a political deal wasn't reached by Saturday.
Wary observers inside and outside the country, including the warring sides, have approached the latest cease-fire with cautious optimism at best. A joint statement by the United States, Britain and Norway warned that effects of the halt in fighting must be seen on the ground: "It must lead to...an end to the horrendous abuses endured by civilians at the hands of security forces."
The latest talks between the rivals have yet to agree on a power-sharing deal, as the government has rejected the idea of Machar again becoming Kiir's deputy. The civil war broke out between supporters of Mr Kiir and his then-vice president Mr Machar in late 2013, just two years after South Sudan won independence from Sudan.
A 2015 peace agreement brought back Mr Machar as vice president but the deal collapsed in July 2016 when fresh fighting erupted in the capital, Juba, with Mr Machar fleeing the country on foot through the bush into Congo.