Crude prices slumped in late London trade after an early rally, as traders reacted to major economic developments in the US, the world's biggest consumer of oil.
Brent North Sea crude for delivery in September shed $1.45 to $115.29 a barrel in late London deals after earlier rising by more than $2. New York's main contract, light sweet crude for September, dropped $1.78 to $93.92 after jumping more than $1.
Prices had initially rallied after US President Barack Obama yesterday announced an 11th-hour deal to avert a potentially catastrophic debt default for the US. But they reversed direction as data showed the US manufacturing sector stalled in July.
The Institute of Supply Management's indexed survey of purchasing managers was at 50.9, down from 55.3 the previous month. A reading above 50 indicates expansion, ISM said. But new orders fell to 49.2 on the index, implying a contraction.
On Friday the US said its economy grew at a dead-pace 0.4% in the first quarter and only 1.3% in the second quarter of 2011.
