ihsanullah is a schoolteacher who was there that day. >> narrator: these home videos show some of the election workers out campaigning. for some of their journey before the strike, they had a police escort, out of concern that the taliban might attack them. >> narrator: ihsanullah told us how two explosions destroyed one of the cars. he said helicopters then fired at those who survived the initial attack. >> narrator: on the scene with local police, we found scraps of election posters. >> narrator: the military remains adamant, even if civilians may have died. it was still a successful mission, because a key taliban commander was also killed. >> this is one of the other strange issues of the case, because... >> narrator: but a group of researchers in kabul challenge this account. for the last eight months, an organization called the afghan analysts network has been investigating this case. >> from very early on, we did mini-biographies of the... of everyone in the convoy, whether they were killed, injured, escaped unharmed. >> narrator: the most prominent of those killed was an afghan