Since the mass firings were carried out three months ago, Justice Department officials have consistently portrayed them as personnel decisions based on the prosecutors' "performance-related" problems. But, yesterday, officials acknowledged that the ousters were based primarily on the administration's unhappiness with the prosecutors' policy decisions and revealed the White House's role in the matter.

I think this has been expected by some of us for quite some time.

White House Backed U.S. Attorney Firings, Officials Say - washingtonpost.com