JUBA - South Sudan accused Sudan of launching an attack in an oil region of the newly independent state on Tuesday and said it was preparing to strike back, in another sign of the festering violence along the frontier.
The scale of the fighting was not immediately clear.
Weeks of border clashes have stoked fears that South Sudan and its northern neighbor could return to all-out war after failing to resolve wrangles over oil revenues, border demarcation and other issues since the south seceded last year.
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