political fallout. now using mexico's freedom of information act, we know who died and the weapons. a home covered in blood after gang members killed 16, many teen-agers, at a birthday party in juarez, mexico. guns traced to fast and furious. >> they are waiting for an answer. they want to know what happened and why they didn't stop these guns from leaving the united states and ending up in climbs. >> spanish language and fox news obtained a list of weapons recovered in mexico and compared the serial numbers with the 2,000 guns sold in fast and furious. nearly two dozen matched. connecting an untold number of injuries and fatalities to the u.s. program. this woman lost two sons to fast and furious guns.