Who’s Causing Trouble in Iraq?

This morning's LA Times has an interesting piece on who is actually sowing the mayhem that continues to take place across Iraq:

BAGHDAD — Although Bush administration officials have frequently lashed out at Syria and Iran, accusing it of helping insurgents and militias here, the largest number of foreign fighters and suicide bombers in Iraq come from a third neighbor, Saudi Arabia, according to a senior U.S. military officer and Iraqi lawmakers.

About 45% of all foreign militants targeting U.S. troops and Iraqi civilians and security forces are from Saudi Arabia; 15% are from Syria and Lebanon; and 10% are from North Africa, according to official U.S. military figures made available to The Times by the senior officer. Nearly half of the 135 foreigners in U.S. detention facilities in Iraq are Saudis, he said.

Fighters from Saudi Arabia are thought to have carried out more suicide bombings than those of any other nationality, said the senior U.S. officer, who spoke on condition of anonymity because of the subject's sensitivity. It is apparently the first time a U.S. official has given such a breakdown on the role played by Saudi nationals in Iraq's Sunni Arab insurgency.

He said 50% of all Saudi fighters in Iraq come here as suicide bombers. In the last six months, such bombings have killed or injured 4,000 Iraqis.

And yet, apropos of all the recent saber-rattling against Iran that's taken place lately, the most interesting line in the piece may be this one:

Both the White House and State Department declined to comment for this article.

Why do they have nothing to say about the Saudis?