A Christchurch youth has been charged with extortion, accused of sending threatening letters to families living in the hill suburb of Mt Pleasant.
The male was arrested on Sunday afternoon and will appear in Christchurch District Court on Thursday, police say.
The boy has been charged with two counts of extortion related to threatening letters sent in June this year.
"The complainants have been advised and are relieved that the male [allegedly] responsible will be held to account for the stress he has caused to them and to the people living in the Mount Pleasant community," Detective Senior Sergeant Michael Ford said in a statement.
In June, families from Mt Pleasant School - a primary and intermediate school with a role of about 340 - received letters threatening to harm their children and demanding money.