World oil prices retreated further this morning as the dollar strengthened and as enthusiasm for last week's euro zone debt deal faded.
US crude slid 83 cents to $92.49 a barrel, while Brent North Sea crude dropped 60 cents to $109.31.
Crude prices rallied last week after a breakthrough euro zone sovereign debt crisis deal helped ease stubborn concerns that it could spark a new global recession.
They closed lower, however, on Friday and extended losses today as dealers grew sceptical that the debt deal would fully resolve the euro zone's long-running crisis.
The euro slid to $1.3981 this morning, making dollar-priced crude more expensive for buyers using the euro and in turn dampening demand for oil.
