A Taliban commander who has been in hiding for seven years has broken his silence in a video given to TV networks.

Jalaluddin Haqqani, appearing frail but defiant in the video aired on Al Jazeera on Saturday, vowed a renewed campaign in Afghanistan against US and Nato "invaders".

The video shows more than one attack, including what is believed to be a Taliban suicide bombing of an American compound in Afghanistan, alongside a taped message by Haqqani.

"The Americans said the Taliban was beaten and defeated but we are not defeated," said Haqqani in the video.

"It was our tactical plan to fade away and prepare for a guerrilla war."

He added: "We will defeat [George] Bush [the US president] and continue our jihad until doomsday."

Seven-year silence

Because he remained silent for seven years, many had assumed Haqqani was dead and rumors to that effect had circulated in the international media.

Haqqani is the head of the Taliban in south eastern Afghanistan, along the border area with Pakistan's North and South Waziristan.

Al Jazeera's Kamal Hyder, reporting from Pakistan, said the video had prompted serious concern among Pakistani authorities, seen as allies to Washington in its fight against the Taliban and al-Qaeda.

"This is a senior Taliban commander, in the past seven-and-a-half years nobody has seen him, now he's promising an intensified campaign that is likely to have its effects on the Pakistani tribal areas [the Waziristan region]," said Hyder.

Military "brains"

Haqqani is one of the most well known Taliban leaders and is believed to be the brains behind the group's current attacks on US and coalition forces in Afghanistan.

"He is very well respected in his home province of Paktia [in Afghanistan]. In fact, Haqqani was the man who started the campaign after the US-led invasion of Afghanistan," said Hyder.

Haqqani's three sons are known to help lead his network of fighters, including Taliban and foreign fighters associated with al-Qaeda.

The group has claimed responsibility for several attacks in the past, including one on a luxury hotel in Kabul, the Afghan capital, in January which killed seven people.

PHOTO CAPTION

Jalaluddin Haqqani, a Taliban commander

Al-Jazeera