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Oil prices have tumbled to seven-week lows amid concerns that the slowing US economy will weaken demand.
US sweet, light crude fell $2.64 to trade at $122.85 a barrel - more than $20 off their peak earlier in July, when prices reached a record $147.27.
Brent crude in London also fell, dropping $2.72 to $123.72.
The oil market has been volatile as traders assess whether there will be enough supply to meet demand.
(BBC)
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