West Yorkshire Police say it is treating the incident as a malicious communications offence.
Both Leeds and Bradford councils said the email had been sent to "a number of schools"
A man arrested in connection with a threatening email sent to schools in Leeds and Bradford has been released without charge. A number of schools kept pupils inside on 14 September after receiving the email, though security sources told the BBC it was being treated as a hoax.A force spokesperson said its inquiries were ongoing.
In a message seen by the BBC, one school told parents the email had threatened "harm" to children and staff.Follow BBC Yorkshire on
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