they used in the berlin attack in which the attacker eventually was killed by police but it wasn't a suicide operation formally at the beginning. so the fact that it's not a suicide operation i don't think invalidates isis' claim of responsibility. it is quite likely this they inspired the attack. >> at least inspired but directed as well? >> i don't know. one of the two. >> at least inspired. michael weisma. the nightclub was frequented by a lot of high-profile crowd. was this a symbolic location that this guy was going offer? >> yeah. it's in a secular neighborhood of istanbul. you have a major holiday, which all jihadists call on each other to attack during the holiday season. this is the softest of targets. he killed one police officer outside. that's not much of a security