busy market. >> translator: i saw the bomb hit the bus. it blew it into those shops and threw bodies clear to the other side of those buildings. we found bodies scattered everywhere. there was a severed head inside. >> this video was filmed in the aftermath of the attack. a cameraman working for cnn subsequently filmed these images for us. munitions experts say this was a u.s.-made mk 82 bomb weighing half a ton. the first five digits there are the cage number, the commercial and government entity number. this denotes lockheed martin. >> we're at the forefront that makes them real. >> this particular mk 82 is a paveway, a laser-guided precision bomb. its targeting accuracy a particular point of pride for lockheed martin.