. >> i'm cyril vannier. >> the u.s. military is promising an investigation into the deaths of civilians and whether air strikes are to blame. >> they confirm one strike hit an isis truck packed with explosives on march 17th, but it's unclear what happened after that. >> an iraqi commander said the blast killed dozens in nearby homes. isis may have booby trapped the buildings. >> cnn is following all this and joins us now from istanbul in turkey. an investigation is under way and we don't know what caused the deaths. >> rosemary, it has been more than a week since this. it's a confusing and chaotic situation. so many conflicting reports. here's what we do know. according to local officials in mo cell according to the civil defense, an air strike caused a large number of civilian casualties. the u.s. as you mentioned and the iraqi militaries are both investigating the incident and what happened. the americans say they did carry out an air strike in this area where the incident took place, but they are trying to piece toge

. >> i'm cyril vannier.