The Catholic Bishops' Conference of Japan has found 16 cases of sexual abuse against minors spanning from the 1950s to the 2010s in its internal probe of churches in the country, sources familiar with the matter said Thursday.

The Tokyo-based organization has been investigating all its 16 dioceses and other convents in Japan since last May, calling for people to come forward with reports of sexual abuse regardless of when it occurred.

The investigation found some elementary school students — both boys and girls — as well as a child under the age of 6 were among those who had been subjected to sexual abuse, which took place in a priest's room, church buildings and other facilities run by convents including foster homes, according to the sources.