DUBAI: Ayman al-Zawahiri, Al-Qaeda's long-time number two, has threatened in a video eulogy to Osama bin Laden to pursue his late leader's jihad against the West, SITE Intelligence Group reported Wednesday.

“We will pursue the jihad until we expel the invaders from Muslim lands,” he was quoted as saying in the eulogy to bin Laden who was killed in a US raid in Pakistan on May 2.

“The man who terrified America in his life will continue to terrify it after his death,” he added in the video message titled “The Noble Knight Dismounted,” which SITE said was posted on jihadist online forums on Wednesday.

“You will continue to be troubled by his famous vow: You shall not dream of security until we enjoy it and until you depart the Muslims' lands,” added the Egyptian militant, who was in white garb and a turban with a machinegun behind him.

He vowed to make sacrifices needed to “deprive America of security.” In an audio message on May 22, Zawahiri backed the wave of Arab revolts and called for sharia Islamic law to be applied in Egypt.

But he warned Libyans the Nato-led aerial bombing campaign against Moamer Kadhafi seeks to replace the strongman with its own tyrannical regime.