Although they deny it, you know darn well that this is a situation that could have been resolved with a couple intelligent questions. The first line of defense against this kind of thing is the teacher. All the teacher had to do was ask the student for clarification. Next if the teacher kicks this up to the principal or counselor, it's really easy for the principal or counselor to apply a little commonsense. Assuming that so far all the adults in the equation are morons and they call law enforcement, then most any officer should be competent enough to correctly understand the situation. If it turns out that all of them are morons, then it turns into a headline like this.
...an elementary school kid in the UK earned a visit to his home from authorities after writing in an English assignment that he lived in a "terrorist house", when he ... was trying to say he lived in a "terraced house." The crux of this story was that the UK's Anti-Terrorism law, which requires that school teachers act as surveillance agents for the state... The resulting visit to the boy's home by the authorities from a misspelled word was billed as an example of this overreach by government.
LINK:
https://www.techdirt.com/articles/20160122/07335533405/uk-police-deny-misspelling-led-to-investigation-say-it-was-other-schoolwork-instead.shtml