The group has become so confident after battlefield gains, that it no longer has sanctuaries in Pakistan, and instead felt secure inside Afghanistan, said Sirajuddin in a rare interview, by telephone from an undisclosed location.
The militant leader is described by US forces in Afghanistan as one of their most lethal enemies. The United States has posted a bounty of up to $5 million for him. The Haqqanis rejected several peace gestures from the United States and President Hamid Karzai's government in the past because they were an attempt to "create divisions" between militant groups, he said. Any further efforts to do so would fail, added Sirajuddin.
"They offered us very very important positions but we rejected and told them they would not succeed in their nefarious designs. They wanted to divide us," said Sirajuddin. "We would support whatever solution our Shura members suggest for the future of Afghanistan," he said, referring to the Afghan Taliban leadership.
Washington has repeatedly pressed Pakistan to go after the Haqqani network it believes is based in the unruly North Waziristan tribal region near the Afghan border. "Gone are the days when we were hiding in the mountains along the Pakistan-Afghanistan border. Now we consider ourselves more secure in Afghanistan besides the Afghan people. Senior military and police officials are with us," said Sirajuddin, believed to be in his late 30s. "There are sincere people in the Afghan government who are loyal to the Taliban as they know our goal is the liberation of our homeland from the clutches of occupying forces."
HIGH ON THE US HIT LIST Defense Secretary Leon Panetta warned Pakistan on Wednesday the United States would "do everything we can" to defend US forces from Pakistan-based militants staging attacks in Afghanistan. US officials suspect militants from the Haqqani network were behind Tuesday's rocket attack on the US embassy compound in Kabul, as well as a recent truck bomb that wounded 77 members of the American forces.
The Haqqani network is perhaps the most divisive issue between allies Pakistan and the United States, whose ties have been heavily strained by the unilateral American raid that killed Osama bin Laden in a Pakistani town in May. If it is confirmed that the Haqqanis have left North Waziristan, American pressure on Pakistan to eliminate the group may ease.
ROLE IN KABUL SIEGE? Haqqani refrains from attacking the Pakistani state, and analysts say Pakistan sees the Haqqanis as a counterweight to the growing influence of rival India in Afghanistan. US officials have played down the significance of Tuesday's attack on Kabul's diplomatic enclave, which showered rockets on Western embassies in a show of insurgent strength.
It was the longest and most audacious militant attack on the Afghan capital in the decade since the Taliban was ousted from power, and a stark reminder of insurgents' reach as Western forces start to return home. Five police and 11 civilians, including children, were killed in the multi-pronged attacks, which included three suicide bombings.
Asked if the Haqqani network was behind the assault, Sirajuddin said: "For some reasons, I would not like to claim that fighters of our group had carried out the recent attack on US embassy and Nato headquarters. Our central leadership, particularly senior members of the Shura, suggested I should keep quiet in future if the US and its allies suffer in future."
The Haqqani network is believed to have extensive ties with some of the world's most dangerous militant groups, including al Qaeda, in North Waziristan and elsewhere. Pacifying the Haqqanis could boost the chances of a peaceful settlement in Afghanistan, where violence is at its most intense since the overthrow of the Taliban government in late 2001.
While Jalaluddin is still revered by militants, ill health forced him to pass on leadership of the group to Sirajuddin, who is seen as far more ruthless. Asked whether there are 10,000 Haqqani fighters as some media reports have suggested, Sirajuddin laughed and said: "That figure is actually less than the actual number."
The Haqqanis are thought to have introduced suicide bombing to Afghanistan, and are believed to have been behind high-profile attacks there, including a raid on Kabul's top hotel, an assassination attempt on the president, and a suicide attack on the Indian embassy.
In one example of the Haqqani group's effectiveness, they are believed to have helped an al Qaeda suicide bomber who killed seven CIA agents at a US base in eastern Afghanistan last year, the deadliest strike on the agency in decades. Pilotless US drone aircraft have tried to eliminate senior figures in the group in North Waziristan. Sirajuddin's younger brother was killed by a drone missile strike.
ANTI-SOVIET ALLIES Washington has not always regarded the Haqqanis as enemies. Former US Congressman Charlie Wilson, who raised money for the Afghan anti-Soviet resistance, once called Jalaluddin "goodness personified". The warrior was held in such high esteem he visited the White House when Ronald Reagan was president.
Nowadays, the United States spends a great deal of time trying to persuade the Pakistanis it is in their interest to eliminate the Haqqanis, for the sake of regional stability. "We've seen in the past what happens when terrorists are given a de facto safe haven, as the Haqqanis have in parts of Pakistan - it doesn't turn out well for either Pakistan or the United States," said a US official in Washington. "The open question is whether Pakistan has the will or the ability to crack down on the Haqqani network. The US has done its part to degrade the group's capabilities but can't do it entirely on its own."