ISLAMABAD: The United States has drastically scaled back the number of drone attacks against militants in Pakistan and has limited strikes to high-value targets in response to growing criticism of the program in the country.

Those actions appear to have temporarily appeased Pakistan's powerful generals, who publicly oppose the covert CIA strikes, US officials said. But some officials are still worried about pushback from Pakistan's new civilian leaders, who took power in June with a strong stance on ending the attacks altogether.

The future of the drone program is likely to be a key item on the agenda during US Secretary of State John Kerry's visit to Pakistan, which is expected soon. Only 16 drone strikes have taken place in Pakistan so far this year, compared with a peak of 122 in 2010, 73 in 2011 and 48 in 2012, according to the New America Foundation, a US-based think tank.

The CIA has been instructed to be more cautious with its attacks, limiting them to high-value targets and dropping the practice of so-called ''signature strikes'' — hitting larger groups of suspected militants based purely on their behaviour, such as being armed and meeting with known militants, said a current US intelligence official and a former intelligence official briefed on the drone program.

The CIA embraced the measures, feeling the drone program may be under threat from public scrutiny, the officials said, speaking on condition of anonymity because they were not authorised to discuss the classified program publicly.

Two other senior American officials said the US scaled back the number of attacks and tightened up its targeting criteria as a concession to the Pakistani army, which some consider the final arbiter on the future of the drone program.

Senior Pakistani army officers made it clear that the program could not continue at the tempo it was being carried out and expressed concern that civilian casualties were breeding more militants, said the US officials, speaking on condition of anonymity.

The circumstances surrounding a strike on July 3 in North Waziristan illustrated Washington's intention to go after well-identified targets only, said one of the officials. The attack on a house, which killed at least 16 suspected militants, was backed up by ''hugely detailed'' intelligence laid out in a 32-page PowerPoint presentation.

The intelligence indicated the target was a gathering of militants from the Haqqani network who were plotting a second attack on the Ariana Hotel in the Afghan capital of Kabul, said the official. The Ariana Hotel has long been suspected of being used by the CIA as a listening post.

President Barack Obama signalled the administration's new approach to drones in a landmark speech in May in which he said attacks would be carried out only on ''terrorists who pose a continuing and imminent threat to the American people'' and when there is ''near-certainty that no civilians will be killed or injured.''

Senior US officials insist they continue to have a secret agreement with Pakistan, or at least from the army, to conduct drone strikes.

But even that agreement seems to be based more on Pakistan's fear of what would happen if it stood up to the US on drone strikes, rather than a real desire to see the program continue. Pakistan relies on the US for hundreds of millions of dollars in civilian and military aid, and even more importantly, for support in getting a $5 billion bailout the country desperately needs from the International Monetary Fund.

The two senior US officials said Pakistani army chief General Ashfaq Parvez Kayani recognises that the White House views drone attacks as vital to its campaign against Al Qaeda and the Taliban, but looks forward to a day when they can stop altogether.

The Pakistani army denied the allegation that Kayani consents to the strikes, calling it an attempt to malign the country and its security agencies. Some Pakistani officials say the drone program has been useful in the past in killing militants but now draws too much attention and controversy, especially after the covert US raid that killed Osama bin Laden in 2011 outraged many who saw it as a violation of the country's sovereignty.

These officials believe Pakistan must be given greater participation in the strikes, or they must be replaced by attacks carried out by the Pakistanis themselves — either with drones given to them by the Americans or their own F-16s.

Pakistan's request that drone technology be transferred to the country is a non-starter because of US fear that highly classified information would make its way to China, a close ally of Islamabad.

US officials often point to Pakistan's failure to shoot down the slow-flying drones as evidence that they aren't sincere in wanting the program to stop, although this would likely cause a huge crisis in relations between the two countries. They also point to the failure of Pakistan to push the issue aggressively with the United Nations or other international organisations.

But some US officials are worried that Pakistan's new civilian leaders, especially Interior Minister Chaudhry Nisar Ali Khan, may spark a crisis over the drone program. Khan said this month that Pakistan has conveyed to the US that the drone strikes could lead to a "direct standoff" and "could have serious implications on the withdrawal of troops from Afghanistan, as well as the post-withdrawal scenario," according to Pakistan's state news agency.

The US military is trucking much of its equipment out of landlocked Afghanistan through Pakistan. Some Pakistani lawmakers have previously advocated preventing the US from using the route unless they stop drone strikes.

Senior Pakistani civilian and military officials have publicly criticised US drone attacks in the past while consenting to them in private. The officials and some rights activists have also claimed the attacks have killed large numbers of civilians, an allegation disputed by the US. The comments have whipped up opposition to drones among the Pakistani public.