What type of fire do you think brought down the Chinook? It could literally have been anything from small arms fire to a hit from a heat-seeking or laser guided missile, particularly if the crew were fighting otherr mechanical problems or if the aircraft was heavily laden with cargo, which would explain why only 10 or so were aboard.
But from what we've heard so far, since it was Afghan instructors sent by the Taliban who taught the Somalis how to successfully attack tAmerican rotary-wing aircraft in Somalia, I'd put my money on an RPG-7 antitank rocket grenade launcher from about 900 meters, if I were inclined to bet on that sort of thing. There's certainly no shortage of either RPG-7 *Knut* launchers or PG-7 antitank rockets in the area, and a hit from one can knock out a tank, much less a thin-skinned Chinook.
