Weapons Traffic: After ouster of ATF head, where does Fast and Furious probe go now?

CSMonitor.com: "The acting director of the Bureau of Alcohol, Tobacco, Firearms, and Explosives Kenneth Melson took the fall for the ill-conceived Fast and Furious gun tracing program on Tuesday. But his departure is far from a clean break between the Obama administration and an operation that allowed over 2,000 guns to "walk" from US gunshops into the hands of Mexican cartels.

... congressional investigators say they have more unanswered questions: 

• Are there are other similar "gunwalking" programs in existence?
• What is the extent of involvement by 12 top Justice officials, including three political appointees: Deputy Attorney General James Cole, Assistant Attorney General Lanny Breuer, and former Deputy Attorney General Gary Grindler, who now works in US Attorney General Eric Holder's office? 
• How were smugglers carrying Fast and Furious arms allowed to resume their travels after being caught in traffic stops? 
• What role, if any, did the Federal Bureau of Investigation (FBI) and the Drug Enforcement Administration (DEA) play in the scheme?"

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