Weapons manufactured in the United States were found to have been used in the Mianwali airbase attack, sources said on Monday.
The sources said that RPG-7, AK-74, M-4 and M-16/A4 were found from the terrorists killed during the operation.
The reports added that weapons used by the US in Afghanistan are being openly sold in the country after the fall of Kabul.
Investigators had recovered American weapons after the attack on Zhob cantonment in Balochistan as well.
Security forces killed nine terrorists after the Pakistan Air Force base in Mianwali was attacked on Saturday.
A statement from the Inter-Services Public Relations added that three aircraft grounded at the facility and a fuel bowser had been slightly damaged.
It was a training base and not an operational one, said a tweet from the state-run PTV.
