Thirty members of the Church of England clergy face being sacked over their failure to stop the most prolific child abuser in the institution’s history. The Church’s national safeguarding team is examining the actions of at least 30 officials named in a report as having prior knowledge of allegations against John Smyth.

Archbishop of Canterbury Justin Welby announced Tuesday that he is stepping down from his position due to a church abuse scandal, according to a statement.

A report found Justin Welby took insufficient action on allegations against John Smyth, believed to be “the most prolific serial abuser” associated with the Church of England.