Oil prices fell below $72 a barrel Tuesday in Asia on investor concern global economic growth could slow in the second half and drag demand for crude down with it. Benchmark crude for August delivery was down 35 cents to $71.79 a barrel at midday Singapore time in electronic trading on the New York Mercantile Exchange. The contract last settled on Friday, losing 81 cents to $72.14. U.S. markets were closed Monday for the Fourth of July holiday. Investor fears of a double-dip recession in Europe and the U.S. later this year after last year's contraction have weighed on stocks and commodities in recent weeks. A weaker than expected June jobs report on Friday added to concern the U.S. economic recovery could peter out once massive government spending stimulus ends.