I can't understand why they're making the pax already boarded stew "until 9pm" when they'll bus them out - why not let the a/c depart? Is there a credible threat to the tower or airside in general? Or is it some emergency plan that's being followed regardless of the actual circumstances?
Probably landed, sitting on taxiway. If airport have been evacuated, then the will be no staff to meet the a/c and pax on stand...pretty straight forward really.