One weekend a year ago the US Government locked the heads of Wall Street's biggest banks into the New York Federal Reserve and gave them one task - to save Lehman Brothers. They failed. Soon after the global banking system came crashing to a halt.
BBC Business Editor Robert Peston went to Wall Street to find out what really happened inside the walls of the Federal Reserve that weekend from those that were there, and asks them, one year one on, what they have learned since then.
One-Minute World News 
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