Quite a comprehensive explanation at the end of the article about the update
Update 17 June: This article was originally published without including key details about this case, due to miscommunication between BBC reporters in court and the writers. We have updated the article to explain that these threats were directed at three all-girls' schools, related to the "misgendering" of trans girls and that Darren Rigby identified in one threat as a trans woman.
We have also included further details from these communications which referred to TERFs, targeting female pupils and staff and included threats to use bladed weapons, a crossbow, a revolver, and poison.
Separately, we have also added reaction from senior leaders at all three schools, in which they explain the fear, disruption and upset caused by these threats to pupils, parents and staff.
We have also included comments from Recorder Eric Lamb during sentencing that despite Rigby's guilty plea at the earliest opportunity, this was a "planned and sophisticated plot" which included measures to make him harder to trace, and the Recorder's references to defence submissions which included Rigby's heavy use of cannabis and alcohol, immaturity, previous convictions and refusals to provide medical information for two psychiatric reports.
We apologise for the failures in our reporting.