The BBC's James Copnall explains the fighting gripping the world's newest state, South Sudan - in 60 seconds
South Sudan's President Salva Kiir says his forces have recaptured the key town of Bor, days after it was seized by rebels in a week-long conflict.
Forces loyal to Mr Kiir's ex-deputy Riek Machar were "on the run", the information minister said. The rebels have not commented on the claim.
There has been a week of fighting amid a struggle between Mr Kiir, an ethnic Dinka, and Mr Machar, of the Nuer.
The UN earlier said that it had reports of at least three mass graves.
One was in Bentiu in the north, and two in the capital, Juba.
Analysis
The growing number of allegations of ethnically motivated killings are deeply concerning. It's important to remember that this crisis is at its heart a political struggle, in a militarised, and, yes, ethnically divided society.
It is wrong to paint this as an "ethnic war", though - it is far more complicated than this. It is also unclear to what extent the military commanders can control the many armed civilians fighting in different parts of the country.
With all that said, international concern about ethnically driven violence is high. Ban Ki-moon has warned that anyone responsible for human rights violations will be held to account. It is to be hoped that these are not empty words.
It said there was "palpable fear" among civilians that they would be killed for their ethnicity.
'Back in control'President Kiir told journalists in Juba: "Forces loyal to the government have taken Bor and are now clearing whatever forces that are remaining there."
Information Minister Michael Makwei told Agence France Presse: "The army captured Bor around sunset and the rebel forces are now on the run... We are back in control."
UN special representative for South Sudan, Hilde Johnson, said the UN could not confirm the claims but said it did appear government forces were in control of at least some parts of the town.
Bor, 200km (125 miles) north of Juba, had been one of the major successes for the rebels. They are believed to still be in control of Bentiu, capital of the oil-producing Unity State.
Some 17,000 civilians had sought refuge in a UN camp in Bor after the rebels took over.
Troops loyal to Mr Kiir had moved quickly from Juba to retake Bor
UN officials say at least 80,000 people have been displaced by the South Sudan crisis - about half of them seeking shelter at a number of UN bases.
Radio Tamazuj said government troops of the Sudan People's Liberation Army had launched attacks on positions held by Nuer commander and army defector Peter Gadet on Tuesday afternoon in Bor.
Some reports said there was still fighting near the airport, and Mr Makwei also said that "shooting continued".
Mr Kiir said there was also fighting in the town of Malakal and that his troops were "ready to capture Bentiu".
Earlier, UN High Commissioner for Human Rights Navi Pillay said: "There is a palpable fear among civilians of both Dinka and Nuer backgrounds that they will be killed on the basis of their ethnicity."
Salva Kiir has agreed to talks "without preconditions"
Riek Machar says he has formed a delegation for talks in Ethiopia
UNHCR spokesperson Ravina Shamdasani said a UN official had seen 14 bodies in a mass grave in Bentiu and another 20 at a riverside nearby.
But she said 75 SPLA soldiers, all Dinka, were unaccounted for there and were feared dead.
The other two reported mass grave sites are at Jebel-Kujur and Newside, near Eden, in Juba.
President Kiir and Mr Machar have both said they are willing to talk.
However, Mr Machar has said his detained political allies must first be freed, while Mr Kiir says there should be no preconditions.
Mr Machar told Radio France Internationale he had spoken to US Secretary of State John Kerry on Tuesday. Mr Machar said he had formed a delegation for talks and that they would probably be held in Ethiopia.
He said: "We want a democratic nation. We want democratic free and fair elections. We want Salva Kiir to call it a day."
Mr Kiir has accused Mr Machar, who he sacked in July, of plotting a coup. Mr Machar denies he is trying to seize power.
The official death toll in the week of fighting stands at 500, but the figure may be much higher.
UN Secretary General Ban Ki-moon has called for an increase in the UN's peacekeepers from 6,800 to about 11,800. A Security Council vote on the resolution is expected later on Tuesday.
Sudan suffered a 22-year civil war that left more than a million people dead before the South became independent in 2011.
Fighting erupted in the South Sudan capital, Juba, in mid-December. It followed a power struggle between President Salva Kiir, a Dinka, and his Nuer ex-deputy Riek Machar. The fear is that the rivalry will spark a widespread ethnic conflict. According to OCHA, 81,000 people have been forced from their homes.
Sudan's arid north is mainly home to Arabic-speaking Muslims. But in South Sudan there is no dominant culture. The Dinkas and the Nuers are the largest of more than 200 ethnic groups, each with its own languages and traditional beliefs, alongside Christianity and Islam.
Both Sudan and the South are reliant on oil revenue, which accounts for 98% of South Sudan's budget. They have fiercely disagreed over how to divide the oil wealth of the former united state - at one time production was shutdown for more than a year. Some 75% of the oil lies in the South but all the pipelines run north
The two Sudans are very different geographically. The great divide is visible even from space, as this Nasa satellite image shows. The northern states are a blanket of desert, broken only by the fertile Nile corridor. South Sudan is covered by green swathes of grassland, swamps and tropical forest.
After gaining independence in 2011, South Sudan is the world's newest country - and one of its poorest. Figures from 2010 show some 69% of households now have access to clean water - up from 48% in 2006. However, just 2% of households have water on the premises.
Just 29% of children attend primary school in South Sudan - however this is also an improvement on the 16% recorded in 2006. About 32% of primary-age boys attend, while just 25% of girls do. Overall, 64% of children who begin primary school reach the last grade.
Almost 28% of children under the age of five in South Sudan are moderately or severely underweight - this compares with the 33% recorded in 2006. Unity state has the highest proportion of children suffering malnourishment (46%), while Central Equatoria has the lowest (17%).
References
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Source http://www.bbc.co.uk/news/world-africa-25509910
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