It is 2 00 a. M. In montreal where Canadian Police are looking for at least four missing young people who they believe have have headed to the middle east to join isis. Authorities say they may have been exposed to extremist views. Police say they left last month headed for turkey and possibly on to syria. Their families alerted police after they became worried the children were becoming radicalized. For months we have only known him as jihadi john. Now we know his name. Mohamed emwazi. I think all the families will feel closure. Another Family Member though reportedly said that he hoped he is brought to justice in course. Alexander field reports on how they figured it out. Reporter the chief isis killer now revealed as mo Mohammed Emwazi seen in videos claiming to murder a group of syria syrian pilots. Ofessional family. He once lived in this london neighborhood. This is a nice area. Responsible, polite quiet. Everything you would want a student to be. He graduated from the university