Fresh worries about the U.S. economy rattled commodities markets, sending prices of several benchmark materials to their lowest levels in months.
Growth-sensitive commodities such as crude oil and copper frequently follow the lead of stock markets as a proxy for demand expectations. The front-month October oil futures contract fell 2%, settling below $72 a barrel for the first time since early July. Gasoline futures slid to $1.8494 a gallon, the lowest closing price since December 2009. Copper fell 1.6%.