It happened as follows:
The F-15 was flying over hostile territory and was shot down with an AA artillery (no SAM). The pilots ejected and an helicopter was sent to rescue them. A crowd of civilians approached to see/salute them, the crew panicked and opened fire. 6 killed or injured. Sad, but not surprising at all.
Injured not killed... and it wasn't the F-15 crew it was the rescue crew which opened fire.
You don't know how the plane was shot down, you'll believe what you want, as will everyone else here.