"The No. 1 enemy in Iraq is al-Qaida," White House press secretary Tony Snow said Wednesday. "Al-Qaida continues to be the chief organizer of mayhem within Iraq, the chief organization for killing innocent Iraqis."

The findings could bolster the president's hand at a moment when support on Capitol Hill for the war is eroding and the administration is struggling to defend its decision for a military buildup in Iraq. A progress report that the White House is releasing to Congress this week is expected to indicate scant progress on the political and military benchmarks set for Iraq.

The threat assessment says that al-Qaida stepped up efforts to "improve its core operational capability" in late 2004 but did not succeed until December of 2006 after the Pakistani government signed a peace agreement with tribal leaders that effectively removed government military presence from the northwest frontier with Afghanistan.

The agreement allows Taliban and al-Qaida operatives to move across the border with impunity and establish and run training centers, the report says, according to the official.

It also says that al-Qaida is particularly interested in building up the numbers in its middle ranks, or operational positions, so there is not as great a lag in attacks when such people are killed.

"Being No. 3 in al-Qaida is a bad job. We regularly get to the No. 3 person," Tom Fingar, the top US intelligence analyst, told the House panel.

The counterterror official said the report does not focus on al-Qaida leader Osama bin Laden, his whereabouts or his role in the terrorist network. Officials say al-Qaida has become more like a "family-oriented" mob organization with leadership roles in cells and other groups being handed from father to son, or cousin to uncle.

Yet bin Laden's whereabouts are still of great interest to intelligence agencies. Although he has not been heard from for some time, Kringen said officials believe he is still alive and living under the protection of tribal leaders in the border area.

Armed Services Committee members expressed frustration that more was not being done to get bin Laden and tamp down activity in the tribal areas. The senior intelligence analysts tried to portray the difficulty of operating in the area despite a $25 million bounty on the head of bin Laden and his top deputy.

"They are in an environment that is more hostile to us than it is to al-Qaida," Fingar said.

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