Why did Dow fall 450 points and Nasdaq over 75 points?

Analysts believe that this Triple-digit swings in the Dow - is overwrought and based more on gut emotion than careful consideration of market and economic fundamentals.

Dow has witnessed its largest one-day point drop since it lost 684.81 on Sept. 17, 2001, the first day of trading after the 9/11 terror attacks. We tried to find and analyse the reasons here they are:

1. Disappointing earnings reports and corporate lending markets which may see more difficult environment for corporate borrowing. Higher corporate borrowing costs will curb the rapid pace of takeovers that have driven major indexes this year.

2. Rising concerns about the mortgage market. Increasing uneasiness about the mortgage market

3. Disappointing durable goods report. Investors moved money into bonds.

4. Disappointing home sales figures - Sluggish environment for home sales and continued defaults in sub prime loans would spur debt defaults and weigh on corporate earnings. Sales of new homes fell 6.6 percent last month

5. But, the real concerns are about credit and oil pushing higher. Investors also reacted negatively as oil prices climbed to almost $77 per barrel during the session, stoking the market's worries about inflation.