weeks there have been several big ones. of course, none of them have targeted foreign dignitaries, let alone someone of such a high status at the ambassador level. it's unclear how russia or turkey will respond. we are awaiting an official claim of responsibility for who was behind this very deadly brazen attack. >> there has been a great deal of tension between turkey and russia over the last 12 months over the war in syria, right, with planes being shot at, apologies being made, and of course, there are kurdish separatists who have staged some of the terrorist attacks inside turkey. if they in fact now are targeting russian officials, we don't know that they are, this would be a serious development. >> reporter: well, of course. there are so many question marks in this. the thing to remember is -- >> all right. we appear to have lost muhammed lila. he's on the syria/turkish