That is a disturbing article since there doesn't seem to be any definite cause. Was it a perfume, pepper spray, something in luggage, or what?
What is worse is that there will be delays:
The check-in counters for American Airlines and US Airways, which are next to the checkpoint, are closed while airport officials continue investigating. No passengers are able to check in that area, which could delay afternoon flights.
If you have never designed an airplane part before, let the real designers do the work!