sorry dude. In the unedited entire version you can pretty clearly see the rpg with one guy, the launcher with another guy, and another carrying a Kalishnakov.....the Reuters "cameramen" are off to the side.

The Wikileaks folks shoulda be more responsible, now they are scared...and rightfully so.
Whistleblowers on US ‘massacre’ fear CIA stalkers - Times Online

This was not some "american" led massacre against poor muslims driving through McDonalds.....no matter how much happiness that woulda brought white leftist trust fund babies. Heads up next time Reuters.