The secure area is not secure?
NO! It's not. I'm sure that is the concern.
I fly 3 weeks out of 4. There are a LOT of people, working, inside the secure area that get very little scrutiny as they move in and out of this area, routinely.
I bet, they have received some specific threat of rings of employees, working inside the secure area, planning to smuggle in explosives to be carried by someone picking them up on the inside.
There are always ways... around security, for an enemy that is patient and cunning.