PHOENIX (AP) — Ten Arizona sheriffs slammed the Obama administration on Friday over a botched federal operation that lost track of up to 1,400 high-powered rifles sold to suspected straw purchasers for Mexican drug gangs, calling for the president to launch an independent investigation and for Attorney General Eric Holder to step down or be fired.Speaking at the state capitol in Phoenix, the sheriffs called the Bureau of Alcohol, Tobacco, Firearms and Explosives' 2009 operation, known as "Fast and Furious," a betrayal of state law enforcement.Pinal County Sheriff Paul Babeu (BAB'-yew) said it's not a partisan issue, noting that the sheriffs joining him were Democrats and Republicans.He says it's a public safety issue, and that the guns have been linked to crime scenes on both sides of the border.