The officials said Badruddin Haqqani, who is also believed to handle the network's vital business interests and smuggling operations, may have been killed during a drone strike this week in Pakistan's tribal North Waziristan region.
One senior Pakistani intelligence official said Badruddin had fled a compound that he and other militants were in after it was hit by a missile, then was killed by a second drone strike on a car that he was in.
There was no official word on Badruddin's fate from the Haqqani network. Other intelligence officials were more cautious.
"Our informers have told us that he has been killed in the drone attack on the 21st but we cannot confirm it," said one of the Pakistani intelligence officials.
If Badruddin's death is confirmed, it could deal a major blow to the Haqqanis, one of the United States's most feared enemies in Afghanistan.
The Haqqanis are the most experienced fighters in Afghanistan and the loss of one of the group's most important leaders could ease pressure on Nato as it prepares to withdraw most of its combat troops at the end of 2014.
"We are 90 percent sure that he was in the same house which was attacked with a drone on Tuesday," said another Pakistani intelligence official.
Sources close to the Haqqqani network also said Badruddin was believed to be in the house, hit by a drone strike as militants were planting explosives in a vehicle meant to be used for an attack on Nato forces in Afghanistan.
"The drone fired two missiles on the house last Tuesday and killed 25 people, most of them members of the Haqqani family," one of the sources said.
Pakistani Taliban and tribal sources said they believed Badruddin was killed in the drone attack.
One of Badruddin's relatives said he was alive and busy with his "jihad activities".
"Such claims are baseless," he told Reuters. Another relative told Reuters Badruddin is "alive and well".
Afghanistan's Taliban movement, allies of the Haqqani network, said Badruddin was alive.
Series of drone strikes
A series of drone strikes in North Waziristan this week suggest the CIA, which remotely operates the aircraft, was after a high-value militant target in the unruly area.
The deaths of militants in such strikes are difficult to confirm because they often occur in remote areas of regions in the northwest like North Waziristan that are hard for authorities to reach.
US officials blame the al Qaeda-linked network for some of the boldest attacks in Afghanistan, including one on embassies and parliament in Kabul in April which lasted 18 hours, killing 11 Afghan security forces and four civilians.
The United States accuses Pakistan's intelligence agency of supporting the Haqqani network and using it as a proxy in Afghanistan to gain leverage against the growing influence of its arch-rival India in the country.
Pakistan denies the allegations.
Militant groups from Afghanistan and Pakistan have formed alliances and often cross the porous border for operations.
A Nato air strike in eastern Afghanistan has killed a commander of the Pakistani Taliban, both Nato and the Taliban said on Saturday.
Both sides identified the dead commander as Mullah Dadullah and said several of his comrades were also killed in the attack on Friday.
A Nato statement did not say who carried out the assault, but the alliance is alone in having the air power to conduct such an operation. It said Dadullah's deputy, Shakir, was also killed.
"Dadullah, also known as Jamal, was responsible for the movement of fighters and weapons, as well as attacks against Afghan and coalition forces," the statement said.
It said Afghan and coalition forces backing the Kabul government had "conducted a post-strike assessment" and found that there had been no civilian casualties or damage to civilian property.
Pakistani Taliban officials, as well as Pakistani intelligence officials said Dadullah had been killed in a house in eastern Kunar province, along with 12 bodygards. They said he was the leader of the Taliban in Pakistan's Bajaur tribal agency, near the border with Afghanistan.
Dadullah, in his 40s, replaced Maulvi Faqir Mohammad last year after Mohammad told the media that the Taliban were holding peace talks with the government.
The Pakistani Taliban, committed to the same Islamist principles as the Taliban ousted from power in Kabul in 2001, replaced Mohammad with Dadullah to undercut the secret negotiations, Taliban commanders say.
Some Pakistani Taliban fighters and commanders were forced to flee into Afghanistan after the Pakistani army launched a series of offensives against them in 2008 and 2009.
But they still carry out cross-border raids on Pakistani armed forces. In June, the Pakistani Taliban said they beheaded 17 Pakistani soldiers in a cross-border raid.
COMMENTS (13)
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How can you live like this in those areas to think you might get killed by Drone any moment... How you sleep, eat, pray or even go to the bathroom without fear... (I just eat my delicious dal and watch... so exciting!!!)
"War on Terror" the movie is being unrolled; they set a date of military withdrawal; "killed" Bin Laden, made a fuss about Haqqani Network; made the American people believe that HN is an ogre; and now killed their leader too. Happy Ending. Poor innocent civilians paid the price!
The goals will be achieved, regardless of BS the GOP or HQ puts out in press ! The US policy is going to be very simple , that they will go after their targets, regardless of what Pakistanis think, furthermore they are unlikely to share any intel with them too, as they are well aware of the complicity of Pakistanis ! Pakistan really has lost any position on this issue, due to their own reluctance to act !
What a blessing in disguise, keep it up dear drones, I love it when it hits a spot like this.
@Muhammad Hassan
Hasnt this dude been killed 20 times before? Its a NYT report, and as always full of misinformation
Now he is in a better place with seventy two hoors taking care of all his needs.
PAKS SHOULD THANK THE U.S. FOR THE STRIKES
It is clear that the Pak military either does not have the capability, even after millions of dollars of aid from the U.S., or the will to go after the terrorists in the lawless Waziristan regions. Absent action by Pak, other countries will take action on their own to protect their interests by invading the nesting grounds of the terrorist.
The chest-thumping so-called patriots like to argue that this is an illegal invasion of Pak territory. I do not agree with those ignorant dimwits. Pak has no sovereignty over this lawless region, and the Pak military quacks in its boots if ever there is any mention for them to invade this region and arrest the terrorists.
I wonder in which overseas bank account are all those U.S. aid funds deposited?
Wild speculations! All these elements are "alive", hale and hearty and are on "Shia hunt" in the Northern Pakistan.
Who gave this story....Express please report better...
Since Pakistani officials have said that he probably died, no taliban-loving conservatives have commented yet...
Only civilians were killed
Most of these people are in kurram/Orakzai/Bajaur