tactics are needed to push isis out of its major strong hold to help keep civilians out of harm's way. >> the iraqi and u.s. military are looking into whether recent air strikes unsbepgsally killed dozens of civilians in mosul. in particular, there are questions about one strike on an isis truck bombing the city on march 17th. >> iraqi commander said the blast killed dozens of people nearby homes. let's found out more who is monitoring this from instanbul. what are we learning about the circumstances of that air strike? >> reporter: well, it's been more than a week since that incident in focus took place. it's really unclear what happened in western mosul. what we do know, is over the past few days, we've heard from local officials in mosul saying that there was a large number of