A pump jack operates at a well site leased by Devon Energy Production Co. near Guthrie, Oklahoma.

Oil prices fell more than 1 percent on Tuesday as the dollar strengthened and investors worried about crude oversupply, bracing for an expected weekly build in U.S. stockpiles.

Warnings of a tropical storm system developing around the oil-and-gas hub in the U.S. Gulf of Mexico limited some of the downside in crude prices, as energy companies announced some production suspensions there.