A few points:
1. This is a bollox bomb note NOT a hijack.
2. Land wherever you deam fit by the simple words " Pan Pan Pan Airline Flight 123 request diversion to land at NEAREST THAT TAKES YOUR FANCY due to security".
3. By the time that has been kicked up the chain of command and down again you'll be passing 20,000ft and well underway.
4. If you are concerned about a bang when on the ground then get on the radio to TWR and say " Mayday Mayday, Boeing 123 on Fox 3 Apron request steps in 3 minutes of else will have to evacuate 2 over 80yr wheelchair bound grannies plus 7 under six month old babies plus one paraplegic down the slides.... request ambulances...
Sod the police. You are in charge of the people on board ypur aeroplane. If you want to then evacuate them all at will and let Plod deal with the consequences.
AP