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Worries about the health of the global economy and gains for the U.S. dollar sent crude oil futures lower Thursday in New York.

Light, sweet crude for November delivery dropped $4.56 to $93.97 a barrel on the New York Mercantile Exchange, and Brent crude fell $4.77 to $90.56 a barrel.

Reformulated gasoline futures declined by 11 cents to $2.26 a gallon, and heating oil slid 14 cents to $2.71 a gallon.

Among stocks, integrated oil and gas companies

Exxon Mobil

(XOM) - Get Free Report

,

Chevron

(CVX) - Get Free Report

and

ConocoPhillips

(COP) - Get Free Report

all saw their shares fall.

Refiners

Valero

(VLO) - Get Free Report

and

Tesoro

(TSO)

gave back more than 11% each. Services names

Halliburton

(HAL) - Get Free Report

and

Schlumberger

(SLB) - Get Free Report

also declined.

The

U.S. Oil

(USO) - Get Free Report

ETF, which tracks crude prices, slid 4.7%.

This article was written by a staff member of TheStreet.com.