In an unprecedented move, the Supreme Court sent a protest letter Tuesday to the publisher of a monthly magazine that printed confidential prosecution documents on the Kobe boy who last year killed and beheaded an 11-year-old boy.

The March edition of Bungei Shunju, which hit bookstores Tuesday, carried the full text of the boy's confessions to the Kobe District Public Prosecutor's Office during interrogations between July 5 and 21 at Kobe's Suma Police Station.

The prosecution documents describe in graphic detail how the boy killed Jun Hase and attacks on elementary school girls, one of whom died.