CAIRO (AP) - Al-Qaida in Iraq vowed yesterday to carry out "major attacks," insisting in a Web statement that it was still powerful after the death of leader Abu Musab al-Zarqawi.

The statement did not name a successor to al-Zarqawi, who was killed by a United States airstrike Wednesday. But it said the group's leadership "renews its allegiance" to Osama bin Laden.

Bin Laden "will see things that will bring joy to his heart," it said, vowing "to prepare major attacks that will shake the enemy like an earthquake and rattle them out of sleep."

The authenticity of the statement could not be independently confirmed. It was posted on an Islamic militant Web forum where the group has posted statements in the past.

Gen. George Casey, the top United States commander in Iraq, told "Fox News Sunday" he expected the statement from al-Qaida in Iraq because "they're hurt badly." He said there had been a "steady drumbeat" of operations against al-Zarqawi's network since the leader's hideout was bombed.

"It's expected, but I think we'll be prepared for it," Casey said of the threat. "But again, you can't stop terrorist attacks completely."

The statement was issued in the name of al-Qaida in Iraq but was put out by the Mujahedeen Shura Council, an umbrella organization of five insurgent groups that al-Zarqawi helped create.

The statement said the leadership of al-Qaida in Iraq met after al-Zarqawi's death and "agreed to continue jihad (holy war) and not be affected by his martyrdom."

"The organization has strengthened its back, regained its footing and has been renewed with fresh blood," it said, listing previous prominent members who had been killed without setting back the group's attacks.

"For those who were waging holy war for the sake of al-Zarqawi, al-Zarqawi is dead. But for those who were fighting for the sake of God, God is alive and eternal," it said.

The phrase echoed the words used by the Prophet Muhammad's successor, Abu Bakr, after the prophet's death in the seventh century to urge Muslims to stick to their new faith.

The message did not name who will succeed al-Zarqawi as the group's leader.

Thursday's al-Qaida statement was signed by al-Zarqawi's deputy emir, Abu Abdul-Rahman al-Iraqi, and sympathizers quickly flooded Web forums with vows of allegiance to him.

But yesterday's message did not mention his name. There is confusion over whether he is still alive, after the United States military said a man named "Abdul-Rahman," whom it identified as al-Zarqawi's spiritual adviser, died in the airstrike alongside his leader.

The military has said the mostly likely successor is an Egyptian associate of al-Zarqawi named Abu Ayyub al-Masri, who has a $50,000 bounty on his head.