Wall Street's Wild Ride

Glitch may have triggered stock plunge

A suspected trading error sparks one of the most turbulent days in stock market history.

'Machines just took over' 

Also: 

• Panic on Wall Street
• Contagion fears in Europe
• More on the debt crisis

How billions vanished in milliseconds

"High-frequency trading" on Wall Street means vast damage can be done in a blink.  

Some stocks dropped to a penny 

Also: 

• No 'fat finger' glitch
• Another volatile day
• More on stock glitch