How to say X were said to do Y? Example:


  The hijackers were said to demand the plane to fly to Iran


The only think I could think of was 有人告訴 (somebody said), and putting it at the beginning, like:


  有人告訴劫機者...


Is this right? Or is there a better option?
X were said to do Y


can be translated to


  据说X想做Y


PS.


  The hijackers were said to demand the plane to fly to Iran


is equal to


  It is said that hijackers demanded the plane to fly to Iran.