Cairo, Egypt ? In a new video aired Monday, al-Qaida’s No. 2 Ayman al-Zawahri mocked President Bush as a “failure” in the war on terror, called him a “butcher” for killing innocent Pakistanis in a miscarried airstrike and chastised the United States for rejecting Osama bin Laden’s offer of a truce.

Al-Zawahri, wearing white robes and a white turban and speaking in a forceful and angry voice, also threatened a new attack in the United States – “God willing, on your own land.”

The video, broadcast on Al-Jazeera TV a day before Bush delivers his State of the Union address, provided the first concrete evidence that al-Zawahri was still alive after the Jan. 13 airstrike in eastern Pakistan that targeted him but killed four other al-Qaida leaders and 13 villagers.

The message came on the heels of a Jan. 19 audiotape by bin Laden, the al-Qaida leader’s first tape in more than a year. Bin Laden said his followers were preparing an attack in the United States and offered the Americans a conditional truce, though he did not spell out terms.

A U.S. counterterrorism official, who spoke on condition of anonymity in compliance with office policy, said there is no reason to doubt the authenticity of the al-Zawahri video, which U.S. intelligence officials were analyzing.

The counterterrorism official noted the video was disseminated quickly, demonstrating al-Zawahri’s ability to get his message out even faster than bin Laden. That suggests bin Laden may be in a more remote location than his deputy, the official said.