On Sunday, al-Qaida in Iraq appeared to have answered Iraqi and U.S. questions about the future plans and tactics of the organization that al-Zarqawi founded.
In an Internet statement, the group vowed "to prepare major attacks that will shake the enemy like an earthquake and rattle them out of sleep."
Gen. George Casey, the commander of U.S. forces in Iraq, said he took the threat seriously but suggested a surge in al-Qaida rhetoric showed the insurgency was "hurting."
"Now, that said...it still has the capability to generate terrorist attacks across Iraq," he said on CBS' "Face the Nation."
Iraqi and American officials said Sunday they planned a new security crackdown in Baghdad in response tot he threats. Iraq's new Sunni Arab Defense Minister, Abdul-Qader Mohammed Jassim al-Mifarji, said a security plan was to be put in place around Baghdad to deal with a possible surge in terror attacks, the AP reports.