The mails were sent by a group 'Terrorizers111', which had earlier also sent such threatening communications.
The schools included Delhi Public School, Modern Convent School, and Shree Ram World School, a senior police officer said, adding that the threats were received via e-mail.
A purported Telegram post circulated on social media, which claimed that the blast was carried out in retaliation to the "targeting" of pro-Khalistan separatists allegedly by Indian agents.
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