still to be determined. >> asorry to ask you so many detailed questions, it's the reporter in me, did the bag go through the screener and did it show up on the screen and that's how it was detected? can you explain that just briefly? >> that's still to be determined. i don't know the answer and i wouldn't want to offer a conjecture. >> do you mean how many shots were fired from the weapon? >> i think it was just one and that's what created the chaos there in the area. but one of the other reasons as well is when everyone moved on out, it impacted the rest of the airport. because we are the busiest airport in the world and so important to the commercial aviation system, we had to make sure that all the rest of the passengers throughout the concourses were addressed. those passengers who had made their way to the tarmac will be re-screen and operations will be