JUBA (Reuters) - Youths armed with sticks, machetes and spears battled police in a South Sudanese town, forcing thousands of civilians to seek refuge in a U.N. compound, officials and witnesses said.
At least 13 people died in the clashes that broke out on Wednesday in the northern town of Wau, a medical source told Reuters.
South Sudan won independence from Sudan last year. Since then its government has struggled to assert control over an impoverished country the size of France that is awash with arms after decades of civil war, rebellions and tribal clashes.
Details were unclear but government spokesman Barnaba Marial Benjamin said the latest clashes broke out after the bodies of six Dinka tribes people were found in the town.
It was believed the six were among 28 farmers abducted in retaliation for another outbreak of deadly violence in Wau earlier this month when security forces opened fire on a protest against plans to relocate a local authority's headquarters.
"Six bodies were brought to Wau town three days ago raising tension among various communities in Wau, which is believed to be the cause of yesterday's violence," Benjamin told a news conference in the capital Juba.
It was not immediately clear why the kidnappers had chosen to abduct those farmers.
Human rights groups regularly accuse South Sudan's army and police, a collection of former guerillas, of heavy handed tactics and human rights abuses - charges dismissed by the security forces.
Up to 300 armed Dinka youth set fire to several buildings in Wau, the main town of South Sudan's Western Bahr El Ghazal state which borders Sudan, according to the United Nations. Police used teargas to disperse the protest, while shooting could be heard, residents said.
"Some youths ... began the shooting. Police intervened and began exchanging fire with them," a witness told Reuters.
Benjamin declined to give details of any casualties, saying only the government "regretted the loss of lives and destruction of property".
Kouider Zerrouk, spokesman for the U.N. Mission in South Sudan, said thousands of civilians, mainly women and children, had sought refuge at the U.N. compound in Wau.
"They are under the protection of the mission," he said.
James Deng Dimo, a journalist in Wau, said he had counted four dead bodies and seen several injured people in hospitals.
"People are telling me that there are over 15 killed," he said, adding that he had seen people wounded by machetes, sticks and gunshot.
A medical source at a local hospital said five people had died at her hospital and as many as eight had died at another hospital.
"Other patients were taken to Comboni Hospital (another local hospital) and others to small clinics around town. It appears the number is higher than what I know," the source said, asking not to be identified.
There were no report of further fighting on Thursday and hundreds of police officers patrolled the streets after reinforcements arrived from the capital Juba by plane. Many residents were leaving the town.
"They are going to the rural areas because they fear there might be a repeat. Where I am standing I can see people carrying luggage like mattresses, beds and bags," Dimo said.
A lack of efficient state bodies and widespread violence has hampered plans to attract investment to a country rich in fertile land, oil and minerals.
Reporting by Charlton Doki and Ulf Laessing; Editing by Andrew Heavens