May 6, 2010 stock market decline/plunge: Why did it drop 9% in a few minutes?
Trading error at Citi
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
May 6, 2010 stock market decline/plunge: Why did it drop 9% in a few minutes?

### Response:
Trading error at Citi