Brent Oil Down 13% by Algorithmic Trade

Just last week, oil futures dropped the greatest in a week since December 2008. Brent oil was down 13% to US$109.13. What is the significance of this sudden plunge? And how did it happened in the first place?

About two years, I wrote a similar analysis on such anomalies.

http://denzukefinance.blogspot.com/2010/09/coming-correction-because-of-selling.html