The militants has claimed they have shot it down and then they have taken away the wreckage of aircraft. Since the incident happened in Herat province, which is coterminous with Iran, it might be possible that the Taliban have sold it to Iran. If the Taliban have not sold it to Iran, then, one would wonder, what use the wreckage may have to the Taliban? Apparently nothing and they may destroy it by throwing stones at it, as they do in this video.
According to some, this aircraft has done a great job, so far, on going after the Al Qaeda members and the Taliban militants. Most of the operations have been taking place in Southern Afghanistan, alongside the borders with Pakistan. The area is predominately populated by Pashtun tribe, a major ethnic group in Afghanistan.
In particular and related to this incident, a plausible guess would cast on American UAS operation on Iranian soil, otherwise Herat has not been a hotbed of Taliban activities. Previously, Islamic Revolutionary Guards Corps (IRGC) has often been accused of supplying weapons and funds to the Taliban. It is also possible that the aircraft had cruised alongside the border of Afghanistan adjacent to Iran to observe the Taliban’s movement on the border.