The schools here get bomb threats too often. At least once a year. It's always some unhappy annoying kid. Then you find out who did it and you are for ever saying to yourself.. "there's Bomb Threat Girl".
I don't even live in a city. I live way out in the country in a small town, so these things happen everywhere.
Don't worry too much.
Bombs are hard to make. Kids do the threats to get out of school. Personally, I don't think these kids should ever be allowed back in to the district. Why they are allowed to come back is beyond my thinking. They should be shunned and banished from town.