TTP using american left weapons in Afghanistan for terrorism in Pakistan, American journal

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According to the American journal The Geopolitics, TTP (Fitna al-Khawarij) is continuously attacking Pakistani forces and civilians. The TTP has carried out terrorist operations and violent attacks in KP.
The Geopolitics report states that the value of American weapons in Afghanistan is more than 7 billion dollars, American weapons such as M4, M16 rifles and night vision sights are in the hands of terrorists.
According to the American journal, American weapons are being sold to terrorist networks in the black market of Afghanistan.
Security sources say that Pakistan has proven that the terrorists in Afghanistan are carrying out attacks with American weapons.