Two things:
1) Unbelievable the number of uninspected backpacks going in
2) The police officers were obviously instructed to let everyone pass
Set-up.......
Who ordered that the doors be unlocked? The doors lock on the inside.
“2) The police officers were obviously instructed to let everyone pass”
My key question as I watched was what were the officers told to do. Yes, it seems obvious that they were told to passively let them enter.