, adding to worries about poor demand growth at a time of global oversupply.

The result of Greece's referendum has put in doubt its membership in the euro, pulling down the single currency EUR= against the dollar.

Benchmark Brent crude oil LCOc1 was down 50 cents at $59.82 a barrel at 0725 GMT. U.S. light crude CLc1 traded at $55.05 a barrel, down almost $1.82 from its close on July 2.

The falls left both crude benchmarks at their lowest since mid-April.