some lone individual walking through the subway system with cyanide gas. new york city stays on alert 24/7. this is a reminder the rest of the country it could happen anywhere. unfortunately often these happen in the big apple. >> you've been in the inner circle of investigations like this here in new york city. really on a national level. what is happening right now to try to figure out who did this, why? take us inside and pain the picture for us if you could, sir. >> in new york city, members of new york city bomb squad in conjunction with joint task force and other agencies such as atf will be involved gathering through all the information, forensic information around the hotel. that's why they have blocked off that area, around the car, looking for fingerprints, trying to track down, get a person