Injured victims were receiving treatment in the Nyang county hospital, he told dpa by phone.
He urged South Sudanese people to settle their disputes peacefully rather than resorting to violence.
South Sudan is experiencing a fragile peace after years of civil war, but clashes over resources continue among its pastoral communities.
Clashes between the Dinka and Nuer - the nation's two biggest ethnic groups - also carry a political component.
A political split in 2013 between President Salva Kiir, who belongs to the Dinka ethnic group, and his former deputy Riek Machar, a Nuer, plunged South Sudan into a military conflict.
The two men have now agreed to form a transitional government of national unity by November 12.
--------------------------------------------------------------------------------------------------------------------