The telephone call was construed to be a bomb threat and the airliner was searched, causing more than an hour’s delay for the flight. It was the first instance of any threat involving the royal family and their air travel.Queen Juliana attempted to stop the marriage, first by sending a member of her staff to Madrid to persuade the Princess not to go ahead with a marriage that would be a political disaster for the monarchy in the Netherlands. It seemed to work and the Queen went on Dutch radio to tell the citizens that Princess Irene had agreed to cancel her engagement and was returning to the Netherlands.