Here's a scenario for you.
It is one week after WTC.
160 pax, almost all on board. Dispatcher advises you at STD -5 that 'there is a security problem with the last passenger'.
He explains that a group reservation was made for 6 people. It has just now been noticed that all 6 checked in separately, and unlike a regular group booking they did not ask to be seated together.
Five of them are now on board.
They are scattered throughout the cabin.
As this was 'suspicious' the last member of the group was stopped by an alert agent at the gate. He asked the passenger (of Pakistani origin) to open his carry on bag. Inside the bag they find a large wad of fundamentalist Islamic literature decrying the US and Indian involvement in the Kashmir, quoting Koranic verses regarding how to deal with 'those who fight you' and proposing the vision of a 'liberated Kashmir'.
You are the Captain on this flight.
What do you do?