Pakistan's XII Corps Commander Lt. Gen. Sarfraz Ali was among those killed in the crash. He was previously a contender to the post of ISI chief.
One of the suspects provided a year-long rent-free apartment of $48,200 to a Secret Service agent associated with the White House.
The intelligence agencies' clearance is not only key to bureaucrats' promotions in Pakistan but it's also key to judges' appointment.
DG ISI Lt Gen Nadeem Anjum met senior US security officials, including NSA Jake Sullivan and CIA Director William J Burns.