Oil prices edged up on Monday on fears that new U.S. sanctions against Iran could be extended to start affecting crude supplies, but markets were capped by further signs of growing U.S. production. 

Tensions between Tehran and Washington have risen since a recent Iranian ballistic missile test which prompted U.S. President Donald Trump's administration to impose sanctions on individuals and entities linked to the Revolutionary Guards. 

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Brent crude futures, the international benchmark for oil prices, were trading at $56.86 per barrel at 0037 GMT, up 5 cents from their last close.

 U.S. West Texas Intermediate (WTI) futures were up 5 cents at $53.88 a barrel. 

U.S. energy companies added oil rigs for a 13th week in the last 14, extending a nine-month recovery as drillers take advantage of crude prices that have held mostly over $50 a barrel since OPEC agreed to cut supplies in late November.