Just hours after the death of Border Patrol agent Brian Terry, federal officials tried to cover up evidence that the gun that killed Terry was one the government intentionally helped sell to the Mexican cartels in a weapons trafficking program known as Operation Fast and Furious.

The revelation comes just days after a huge shake-up of government officials who oversaw the failed anti-gun trafficking program and Congress renewed its demand for more answers.

Also late Thursday, Sen. Charles Grassley’s office revealed that 21 more Fast and Furious guns have been found at violent crime scenes in Mexico. That is up from 11 the agency admitted just last month.

“The Justice Department has been less than forthcoming since day one, so the revisions here are hardly surprising, and the numbers will likely rise until the more than 1,000 guns that were allowed to fall into the hands of bad guys are recovered — most likely years down the road,” Grassley said in a statement released Thursday.

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