story for us. reporter: isis released a new video claiming to show the knife attacker who stabbed five people killing one last night in central paris. isis took responsibility for last night's attack calling the knifeman a soldier of the caliphate. according to memory, a nonprofit middle east think tank, the two minute video by isis shows the attacker whose face is partially covered with a hood pledging allegiance to the leader abu bakr albaghdadi. chechnya's president has identified him as a 20-year-old french citizen who was born in the muslim russian republic, a counterterrorism contact tells our catherine herridge that this video proves it's beginning to look like this man was not necessarily an independent inspired actor or so-called lone wolf. in other words, he may have had