CNN had a link up for the video yesterday, I watched it, about 12 minutes total. Of course al-Reuters is incensed over their two journalists getting fired up, but though the chopper crew talk identifies weapons in the hands of the group, it's mostly misidentification of their camera bags as rifles, there may have been one guy with an actual rifle in the group though. Before they are cleared to fire one of them identifies an RPG but I didn't see that from the angle in the shot (Two birds involved, talk from both).
However the rest of the story is that the band of Iraqis was in close proximity to American ground units, and the ground units had received fire from the area very recently, which was why the choppers were there at all. The initial engagement is fully understandable in context, misidentification is a fact of life in war and there is every appearance that the group really was insurgents, squiring the al-Reuters flacks around to get good footage of how they were lighting the Americans up, so screw them.
But, I have to say the gunships probably got a bit too aggressive when they engaged a civilian van that pulled up to render aid to survivors moments before the ground troops arrived, since the reaction force could have snaffled up everyone involved without further loss of life. There was no visual evidence of arms in the van and it turned out to be a family with kids, which the aircrews had no way of knowing since the kids did not get out. It was not a Red Crescent ambulance or carrying any other protected markings, so jumping to the conclusion that it was more insurgents trying to evacuate their wounded was not totally unreasonable, but lighting it up without any positive visual on armed personnel in the van was basically unnecessary. Once you turn the shoot switch on, though, it doesn't go back off like an electric light, so it's pretty easy to understand where the chopper guys had their heads at on this.
It is a fact of life and local culture that again and again, uninvolved Iraqi civilians will try to render aid to the wounded, even though they personally had no stake in the fight. The poor bastards in the van didn't realize the choppers were still hot, to their own cost. The imperative to render that aid is a cultural thing, one of the positive values of Islam actually, which as the chopper talk shows, we tend to completely ignore.
