However local security officials put the death toll far higher, saying about 150 militants died in the air strikes, which primarily targeted Uzbek fighters in a remote area of tribal North Waziristan.
Among the dead are insurgents linked to last Monday's all-night siege of Karachi airport that killed 38 people, including 10 attackers, and all but destroyed a tentative peace process between the Pakistani Taliban (TTP) and the government.
The mountainous Dehgan area, about 25 kilometres west of the main town of Miranshah in North Waziristan, is a stronghold for Taliban and al-Qaeda-linked militants on the border with Afghanistan.
"Today at about 0130 hours, a number of terrorist hideouts in Dehgan, Datta Khel in North Waziristan were targeted by jet aircraft. Over 50 terrorists, mostly Uzbek foreigners, were killed in the strikes," a statement issued by the Pakistani military on Saturday said.
"There were confirmed reports of presence of foreign and local terrorists in these hideouts who were linked to the planning of the Karachi airport attack."
However, local security officials in Miranshah speaking on condition of anonymity put the death toll far higher than the official toll.
"Up to 150 people were killed during the strikes early Sunday. These strikes were carried out based on confirmed reports about the presence of Uzbek and other militants in the area," an intelligence official said.
Another security official said "the number of the killed people was even more than 150".
The Pakistan military has not confirmed the higher figure.
However, the military statement said "an ammunition dump had also been destroyed during the strikes and that further details would follow," suggesting the death toll could rise.
Pressure has been mounting on the Pakistani government to launch a ground offensive in the Taliban-controlled North Waziristan tribal district.
Following the brazen assault in Karachi, the US carried out two drone strikes in North Waziristan on Wednesday, the first time the controversial program has been used this year.
The same day, Pakistani air force jets pounded suspected militant hideouts, leaving at least 25 dead.
No precise number death toll from Sunday's air strikes was immediately available as they took place overnight in a remote location.
There were competing reports about the identity of those killed. But a second intelligence official in Miranshah said Uzbek fighters were targeted.
"Uzbek fighters had gathered in the area, they were taking rest when jets hit them," he said, adding that hideouts of local Taliban and other foreign fighters were also targeted.
Both the Pakistani Taliban and the Islamic Movement of Uzbekistan - an al-Qaeda affiliate mainly based in Pakistan's tribal belt - said Uzbek fighters took part in the Karachi airport assault.
Locals in Pakistan's tribal regions say some of the world's most feared Islamist fighters are quietly slipping away from the area in anticipation of an increase in military operations against them.
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