On May 21, 2016, a U.S. drone strike killed the leader of the Afghan Taliban, Mullah Mansour.
To no one’s surprise, at the time of his death Mansour was in southwestern Pakistan.
The drone strike Pakistan’s longstanding support for terrorist groups.
For example, Pakistan openly supported the Afghan Taliban both before and after the extremists took control of Kabul in 1996. Read more about Pakistan's Safe Havens For Terrorists