(CNN)Here's some background information about Operation Fast and Furious. From 2009-2011, under Operation Fast and Furious, the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) Phoenix Field Division, along with other partners, allowed illegal gun sales, believed to be destined for Mexican drug cartels, in order to track the sellers and purchasers.
An estimated 1,400 weapons were lost by the ATF in Mexico. Two of the missing weapons linked to the operation turned up at the Arizona murder scene of United States Border Patrol agent Brian Terry.
April 2006 - Official launch of Project Gunrunner.