The email ID which sent more than 150 bomb threat letters to various schools in Delhi and adjoining regions of Noida is allegedly sawariim@mail.ru, creating a link of the incident with Islamic terror organisations. The email via which the threat was sent reportedly originated from Russia. However, the police officials have declared it a hoax as "nothing objectionable" was found during searches.

According to the sources, the e-mail ID from which Delhi NCR schools were sent the bomb threat letter has the word 'Sawariim' (clashing of the swords), which is an Arabic word and has been used by the Islamic State since 2014 to spread Islamist propaganda. Delhi Police is investigating if there is a conspiracy of any organisation behind these threatening emails. It is being ascertained if any terror organisation is at work in creating a panic-stricken atmosphere in the national capital.

Bomb threats sent via email to schools in Delhi-NCR originated from Russia, as indicated by the IP address of the email, which was traced back to the domain "mail.ru”. Investigating agencies said it is also possible that culprits may have masked their identity using the darknet. Such mails are often sent from a vpn that helps them mask their real ip address as is the case in these “bomb threat” emails, said the sources.

Further, the wording of all the mails look similar with sources stating that this work is of one accused. The letter read, “Kill them whenever you meet and drive them out of places from which they drove you (2:191). There are many explosive devices in the school…..Did you really think that there would be no answer for all the evil you have done.”

The schools received the threats on their official email IDs around 4 am.  Bomb detection teams, bomb disposal squads and officials of Delhi Fire Service were rushed to schools but nothing suspicious was found. In a statement the Union Home Ministry officials called the mail hoax and said, "There is no need to panic. Mails appear to be hoaxes. Delhi Police and security agencies are taking necessary steps as per protocol.”

However, keeping in mind the security of the citizens, security was beefed up in several parts of the national capital. They have stepped up security at all metro and railway stations, bus stands, and markets.