Schools in three counties had to go into lockdown this week after receiving emails “threatening violence to children and staff”.
West Yorkshire Police said today it had made an arrest in connection with an email sent to a number of schools in Leeds and Bradford.
It added that the contents of the email were being investigated while officers were “providing reassurance and safety advice to affected schools”.
It comes just two days after schools in Manchester and Cheshire were locked down over “malicious communications“, which are also understood to have threatened harm to students and staff.