The closed-door testimony of ATF’s acting director, saying that the Justice Department was obstructing a congressional investigation, has prompted an expansion of that ongoing probe into the controversial “Fast and Furious” weapons-smuggling operation.

“We’ll go wherever the investigation takes us,” said Sen. Charles E. Grassley of Iowa, ranking Republican on the Senate Judiciary Committee and a key inquisitor in probing the operation, during which guns, including AK-47 assault rifles, were “walked” into Mexico.

He said the weekend testimony of Kenneth E. Melson, acting director of the Bureau of Alcohol, Tobacco, Firearms and Explosives, had corroborated information that “more agencies within the Justice Department may have been involved in allowing guns to fall into the hands of known straw purchasers.”

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