Saw on msnbc.com just now that oil has dropped more than $9 per barrel - down to about $136 on the Mercantile Exchange.

Just found this AP piece (varies slightly from msnbc report):

Jul 15, 11:18 AM (ET)

By ADAM SCHRECK

NEW YORK (AP) - Oil prices are tumbling as traders dump the commodity amid concerns about the economy that are also driving the stock market sharply.

Prices dropped more than $10 a barrel from highs earlier in the day, and are now down more than $6 from Monday's closing price. Light, sweet crude is trading at $139.03, down $6.15.

Earlier, it rose as high as $146.73 and fell down to $135.92.

The turnaround may not signal a lasting shift in sentiment - prices have swung violently in recent days as they flirted with record highs. But it does underscore investor uncertainty about whether sky-high oil prices can be sustained and their effect on the broader economy.