Rolling Thunder,
I've operated in the Iquitos area and I can tell you there are very real problems with drug smuggling airplanes. All smuggling pilots understand they will be shot at if they attempt to evade capture/seizure. So far this year, 20 or so light airplanes have been "tagged".
The DEA (flying out of Iquitos) has some fairly sophisticated equipment flying around the area. They provide surveillance support to the Peruvian AF.
Sadly, I think this was a friendly fire type misidentification.
dd