Lawmakers are investigating the operation, in which as many as 2500 guns were sold by the ATF to straw-buyers.

FORBES: Operation Fast and Furious Linked to Death of Mexican Attorney

More than 60, 000 of the retailers tracked by the ATF are indeed mom-and-pop type places.

FORBES: Square Stops Gun Sellers From Using Its Payment Technology

Hoover did not give statistics about the number of hand-grenades seized by ATF, nor were statistics immediately available from the agency.

CNN: Senators want to fight Mexican drug cartels' expanding influence

The FBI has 150 pending investigations associated with animal rights or eco-terrorist activities, and ATF officials say they have opened 58 investigations in the past six years related to violence attributed to the ELF and ALF.

CNN: FBI, ATF address domestic terrorism

Will he take that CR even with the additional elements in it, additional -- voting on amendments to add to it, including ones that the ATF says would make permanent limits and things that weaken the ATF enforcement of gun laws?

WHITEHOUSE: Press Briefing

An ATF official said 55 people were charged with federal and state violations resulting from the seven-month undercover operation.

FORBES: ATF and Local Police Carry Out SWAT Raids Across Omaha

In addition to strengthening the ATF's enforcement power, we need to attack gun trafficking at its source by limiting the high-volume gun sales that fuel trafficking from licensed dealers.

CNN: Commentary: Stop flow of U.S. guns to Mexico drug war

The inspector general also concluded that poor internal information-gathering and communication at the justice department and the Bureau of Alcohol, Tobacco and Firearms (ATF) caused them to misinform Congress about the operation.

BBC: Fast and Furious: Eric Holder cleared but 14 faulted

The row involving Mr Holder centres on a botched operation to curb gun-running from America to Mexico run by the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), a division of the Justice Department.

ECONOMIST: Executive authority v congressional oversight