This, according to a letter from U.S. Assistant Attorney General Ronald Weich to Rep. Darrell Issa (R-CA) and Sen. Charles Grassley (R-Iowa) - chairmen of committtees looking into Fast and Furious.

What's even more shocking? ATF has yet to conduct a comprehensive investigation into how many weapons have been used in violent crimes.

CBS News:

According to a letter from U.S. Assistant Attorney General Ronald Weich to Rep. Darrell Issa (R-CA) and Sen. Charles Grassley (R-Iowa), the disclosed incidents may be only a partial list of violent crimes linked to Fast and Furious weapons because "ATF has not conducted a comprehensive independent investigation."

When added to the guns found at the murder scene of Border Patrol Agent Brian Terry in the U.S., the newly-revealed murders in Mexico bring the total number of deaths linked to Fast and Furious to four.

According to the Justice Department letter:

One AK-47 type assault rifle purchased by a Fast and Furious suspect was recovered Nov. 14, 2009 in Atoyac de Alvarez, Mexico after the Mexican military rescued a kidnap victim.

On July 1, 2010, two AK-47 type assault rifles purchased by Fast and Furious suspects were recovered in Sonora, Mexico after a shootout between cartels. Two murders were reported in the incident using the weapons.

On July 26, 2010, a giant .50 caliber Barrett rifle purchased by a Fast and Furious suspect was recovered in Durango, Mexico after apparently having been fired. No further details of the incident were given.

On Aug. 13, 2010, two AK-47 type assault rifles purchased by a Fast and Furious target were recovered in Durango, Mexico after a confrontation between the Mexican military and an "armed group."

AG Holder continues to stonewall effectively, denying everything and cooperating with Congress only as much as he has to in order to avoid political trouble. It will be a laborious task for Issa and Grassley to get to the bottom of this idiotic program and they may not make it in time for the 2012 election.