there's been a high police presence around train stations, airport, mow en w alem lenbeek alem w it appears that the attackers were able to circumvent security, tight security around this area to be able to strike right at rush hour. >> and there are reports -- we heard reports this morning, charlie, that at least two or three planes would have been heading to the united states within about two hours after the attack happened at 8:00 this morning vchlt you heard anything about that, about the passengers who might have been at the airport at the time? >> reporter: no. gayle, when we got here, it was chaos. we were trying to speak to passengers. the police corralled us essentially. i've covered enough of this tragically that you could see in their eyes they were dealing with an ongoing situation and threat. we'll be trying to do that later. but the entire perimeter has been shut down. this is about as close as we could get and it was just on the other side of that and they set up something like an immediate facility in the field. we haven't been able to talk to passengers leaving the airport.