11.   Boeing is part of another team producing a similar product, prompting FTC concerns that the Rockwell acquisition might give Boeing an unfair advantage.

12.   Bonds have slumped in recent weeks after a series of economic reports showing a strengthening U.S. economy prompted concern inflation will quicken, leading to higher lending rates.

13.   A freak accident getting off a bus in New York last week prompted enough concern to seek out an MRI.

14.   A mid-morning plunge in the U.S. stock market pulled the dollar off its highs, prompting concern foreign investors selling stocks would convert the dollar proceeds into other currencies.

15.   A slumping dollar prompted concern that overseas investors may shy away from Treasury securities.

16.   A stronger-than-expected report could prompt inflation concern among investors, driving stocks and bonds down.

17.   A rising dollar weighed on bonds, prompting concern Japanese investors might shop abroad from more profitable investments.

18.   A slumping dollar prompted concern among portfolio managers that overseas investors may shy away from Treasury securities.

19.   A weaker yen against the dollar will also weigh on prices, prompting concern foreign investors will abandon the yen bond market.

20.   Abroad, Russian leaders also prompted new concerns, announcing plans to dispatch a warship to the Mediterranean.