Battles over cattle between rival factions of the Dinka people, the Rup and Pakam clans, broke out on December 6 in the central area of Western Lakes, some 250 kilometres (155 miles) northwest of the capital Juba.
"More than 60 people were killed, and dozens wounded," Akol Paul Kordit, a local MP who also serves as the country's deputy information minister, wrote in a statement.
Fighting continued with the latest raid at dawn today, it said.
Presidential spokesman Ateny Wek Ateny confirmed the "senseless" attacks, and said security chiefs had been summoned to a meeting on the violence.
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"We condemn it in the strongest terms possible," he said.
Such attacks have worsed amidst the breakdown of society during the four-year civil war which began in December 2013.
Half the country is in need of emergency food and a third has been forced from their homes since then, according to the UN.
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