* Rebels claim gains against government forces (Recasts with quotes from U.N.
WASHINGTON, May 18 (Reuters) - Two oil and gas groups have asked a federal court to block the implementation new U.S. rules for hydraulic fracturing on public lands until their lawsuit challenging the regulations is resolved.
JUBA, May 18 (Reuters) - South Sudanese rebels killed "many" government soldiers in three days of fighting in Malakal, the capital of oil-producing Upper Nile State, a rebel military spokesman said on Monday.
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