Oil tumbles as investors rethink Mideast disruption risk

SINGAPORE (Reuters) - Oil prices on Tuesday surrendered some gains made over the previous two days as investors reconsidered the likelihood of Middle East supply disruptions in the wake of the United States killing a top Iranian military commander. Brent crude fell as much as 1.5% to $67.86 a barrel and was at $68.39, down 52 cents, at 0737 GMT. U.S. West Texas Intermediate (WTI) crude futures were at $62.85, down 42 cents, after earlier dropping 1.5% to an intra-day low of $62.30.Prices..