Futures on Dow Jones Average down more than 500 points

LONDON (MarketWatch) -- If futures contracts traded on a day when U.S. stocks weren't even due to open are anything near accurate, then markets will be in for a major decline on Tuesday, with concerns about bond insurers and the health of financial institutions dragging markets lower.
The Dow Jones Industrial Average futures contract was recently off 520 points at 11,586, the Nasdaq futures were at 1773.25, down 76.25, and the Standard & Poor's 500 futures recently were at 1265, down 60.3.
Futures contract don't move in complete lockstep to the underlying indexes, but by comparison, the Dow industrials fell 382 points on Sept. 20, 2001, just days after the terrorist attack on the Twin Towers, and by 387 points on Aug. 9, 2007, shortly after the recent credit crunch first emerged.