Oil prices fell below $66 a barrel Monday, The Associated Press reported. Benchmark crude for September delivery was down $1.63 to $65.88 a barrel by late morning in European electronic trading on the New York Mercantile Exchange. On Friday, the contract tumbled $3.01 to settle at $67.51. In other Nymex trading, gasoline for September delivery fell 1.7 cents to $1.92 a gallon and heating oil dropped 3.43 cents to $1.81. Natural gas for September delivery fell 7.5 cents to $3.16 per 1,000 cubic feet. In London, Brent prices dropped $1.54 to $69.90 a barrel on the ICE Futures exchange.