Ah, yes. The ever popular ‘we sent out some letters by mistake’.
What they spilt some coffee on the keyboard and must have pressed some keys accidentally while wiping up?
The keys pressed just accidentally spelled out a letter (in no worse English than usual for a government circular) instructing foreigners to report for deportation?
Several copies of the letter were then ‘accidentally’ printed off, ‘accidentally’ put in envelopes, ‘accidentally’ franked and ‘accidentally’ posted?