and an unrelenting willingness to kill anyone who disagrees with their ideological ideology, there is no surprise that hundreds of thousands of iraqis fled when isis took control of mows mosul. the chief executioner known as the desert lion. brutally killing them after discovering they weren't sunni. but the brutality may extend far beyond the middle east. in 2008, their leader, abu bakar al baghdadi soldiers from long island that he would see them in new york. general bob scales joins us. >> hi, greta. >> this chemical factory. >> i have flown over it it's huge. eric after eric of chemical bunkers. it mainly contains mustard gas and sarin gas that's unmixed. >> can it be mixed? >> it can be mixed after 13 years that stuff degrades as