Zawahiri, who is shown wearing a black turban and white robe and speaking against a white background, said the video was to mark the fourth anniversary of the September 11 attacks.
The CNN quoted US intelligence officials saying that Ayman al-Zawahiri was assisting the al-Qaeda chief.
Al-Qaeda deputy Ayman al-Zawahri said his terror network carried out the July 7 London bombings, in a statement, marking the group's first direct claim of responsibility for the attacks that killed 52 people.
Some officials believe that he could have been a replacement for Hamza Rabia, Al Qaeda's operational commander, who was killed in a similar missile attack in Asory village in North Waziristan on December 2.
'Osama bin Laden and al-Zawahiri could be hiding in the tribal areas of Pakistan,' said the US deputy secretary of state.
No let up in crackdown on terror, says Musharraf
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Al-Qaeda prepared the ground for the announcement earlier Thursday in an online message.
In a new audiotape Al Qaeda also criticised Israeli Prime Minister Ariel Sharon's visit to India.
Heaping scorn at a audio tape purported to be from Al Qaeda's second-in-command Ayman al-Zawahiri seeking the overthrow of his government, Pakistan President Pervez Musharraf on Friday asserted he would "eliminate" all Al Qaeda terrorists.
Bin Laden's right hand man Ayman al-Zawahri surfaced on a video aired days before the 9/11 anniversary.
There is no threat from either Al Qaeda or ISIS of a magnitude which the country cannot deal with, National Security Advisor Ajit Doval said on Tuesday but asserted that security agencies were keeping a "very close watch".
The US move comes nearly year and half after Hamza was officially announced by al-Qaeda chief Ayman al-Zawahiri as an official member of the group.
The daily grind of running a major terror outfit not only involves planning major strikes, but also poring over account books and calculating assets and liabilities.
'Trump's new discovery is that Pakistan and its army are virtually god's gift to mankind.' 'They are required to facilitate a relatively orderly American exit from Afghanistan,' points out Ambassador G Parthasarathy, who served as India's high commissioner to Pakistan.
Alexis Sanchez shrugged off an ankle injury and continued his resurgent form at the Copa America. The Chile striker fired his side to a 2-1 victory over Ecuador on Friday which took the holders into the quarter-finals of the competition.
The announcement by Al Qaeda that it has formed a branch for operating in India is not an indication of the terrorist outfit gaining new capabilities, the United States said on Friday, asserting that it is committed to dismantling the group.
In the video titled 'From France to Bangladesh: The Dust Will Never Settle Down', AQIS chief Maulana Asim Umar mentioned Prime Minister Modi in the context of what he claims to be a war against Muslims.
A deputy leader of Al Qaeda's branch in the Indian subcontinent, who was seen as a "rising star" in terrorist circles, died in an American drone strike in Pakistan in January that also killed an American and Italian hostage, according to a media report.
The perpetrators of the 2008 Mumbai attack, who shot dead 166 people, had confessed to details that should have been enough to hang him, but Pakistan enjoyed his anti-India rhetoric and let him spread his tentacles. A revealing excerpt from Khaled Ahmed's Pakistan's Terror Conundrum.
Al-Qaeda chief's daughters released for ex-Pakistan Army chief's son, claimed a media report.
Summary of sports events and persons who made news on Thursday
A member of the banned militant group Laskar-e-Jhangvi was awarded death penalty on 3 separate counts and slapped with a hefty fine of Rs 5 million by a Pakistani anti-terrorism court in Lahore for abducting an American doctor in 2011.
Tehreek-i-Taliban Pakistan's six top commanders on Tuesday pledged allegiance to the Islamic State leader Abu Bakr al-Baghdadi, who has been vying for supremacy with Al Qaeda chief Ayman al-Zawahiri.
The Centre on Thursday sounded a country-wide alert after an Al Qaeda video appeared in which the terror outfit threatened to carry out campaign in India. Home Minister Rajnath Singh went into a huddle with top security officials as an initial assessment of the Intelligence Bureau found the video to be genuine.
This is for the first time in several years a news report has surfaced about the hiding location of the Al-Qaeda chief, who is Osama bin Laden's mentor and successor.
Umer Ahmed, a member of the Al Qaeda-backed Al Nusra, was killed in a suicide bombing in Syria.
The dreaded Islamic State militant "Jihadi John" was a "reasonably hardworking" student and showed no sign of radicalisation, his former UK school principal said on Monday.
A madrassa teacher from Bengaluru has been arrested by Delhi Police for suspected links with Al Qaeda, making it the fourth arrest in its ongoing operation against the terror outfit.
Netanyahu has apologised to Israel's Arab citizens for racist remarks he made during last week's parliamentary election.
Interim Egyptian Prime Minister Hazem Beblawi has put forward a proposal to legally dissolve the Muslim Brotherhood.
The United Sates will continue its fight against the Taliban while seeking a political solution to the Afghan imbroglio, US Secretary of State John Kerry said Thursday even as he rejected Pakistan's concerns on American drone strikes.
Slain Al-Qaeda leader Osama bin Laden's son-in-law Sulaiman Abu Ghayth was on Tuesday sentenced to life in prison for conspiring to kill US nationals and providing material support to terrorists.
Al-Qaeda's reclusive chief Ayman al-Zawahiri is cut off from his top commanders and keeping the outfit afloat only through loyalty as the once world's most feared terror group is steadily losing recruits and funding sources to its splinter faction -- the Islamic State.
Syed Firdaus Ashraf/Rediff.com presents the names of 10 global terrorists who, according to United Nations Security Council, are operating against India from Pakistan.
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