jǐng / fāng / zhèng / zài / diào / chá / zhè / qǐ / kōng / zhōng / jié / chí / shì / jiàn / de / mù / hòu / zhǔ / shǐ

警方正在调查这起空中劫持事件的幕后主使。

The police are investigating who was behind the aircraft hijacking.