in a january 2016 isis execution video. why is this interesting to investigators? it is because isis have claimed this attack. i think there's a possibility here that this london attacker, butt, could have been in touch with his very close friend who had climbed up the ranks of isis and is still believed to be in and around raqqah, syria. that all raising the possibility if he was in touch that he could have uploaded some kind of video to the group. we have seen that before in these kind of attacks. so far, nothing that the investigation has uncovered is suggesting communication to isis. though i would not be surprised if we see that emerge in the coming days. >> julia, time and time after the wakes of events like these, we learn that they were