I wonder if the aircraft and passengers landed somewhere else and was refueled to await "further orders"??
Assuming the aircraft is intact and on the ground, what would be the purpose of this silence by the hijackers/sky pirates?
1. Secret negotiations already in progress?
2. Stealing of valuable cargo/VIP hostage?
3. Time to disperse the pax and crew with a view to hostage negotiations individually and/or
4. Preparing the aircraft to be used as a 'flying bomb' at some future date?
All mentioned before, but if the aircraft has landed safely what other explanation could there be?
If any or all of these scenarios are acted out a new dark age of aviation will be upon us.