Both sides agreed to a cease-fire that took effect Sunday, but there are reported violations in the volatile states of Upper Nile and Unity.
Machar accused government troops of attacking despite the cease-fire and urged President Salva Kiir`s government to control its troops. For its part, South Sudan`s military also accuses the rebels of attacking and breaking the cease-fire.
It is not possible to independently verify the alleged violations.
The U.S. has threatened U.N. sanctions against those who violate the pact.
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