Gunwalker Case now spreads to Grenade Parts for Sinaloa Cartel

The problem keeps getting worse. From Fox News:

Police have arrested a U.S. man for smuggling American grenade parts into Mexico for use by the Sinaloa cartel, and a U.S. official said the case has now been included in investigations into flawed law enforcement operations aimed at gun-trafficking networks on the Mexican border.
The arrest of a man who Mexican police identified as Jean Baptiste Kingery has provided details on a network that allegedly supplied hundreds of hand grenades to Mexico's powerful Sinaloa cartel. Such grenades have been blamed in the injuries or deaths of dozens of civilians in Mexico, where grenades have been tossed into public squares, streets, bars and nightclubs.
A U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives operation, known as Fast and Furious, was designed to track small-time gun buyers at several Phoenix-area gun shops up the chain to make cases against major weapons traffickers. But a congressional investigation says ATF agents of lost track of about 1,400 of the more than 2,000 guns whose purchase they had watched.
In Washington D.C., Justice Department spokeswoman Tracy Schmaler said the department's inspector general has expanded that investigation to include the Kingery case.
"The department is aware of concerns raised" about the Kingery case "and has been looking into it," said Schmaler. "We have notified Congress about this operation and offered to brief them on it."
Schmaler did not say specifically why the greande-smuggling case was being investigated, but the Wall Street Journal reported that Kingery had been detained in Arizona in June 2010 and then released, purportedly because officials wanted to use him as an informant or in a sting operation. . . .