The investigation so far has revealed that 'Sawariim' (clashing of the swords) is an Arabic word, that has been used by the Islamic State since 2014 to spread Islamist propaganda.
All schools in Delhi-NCR to which threat emails have been sent have been closed as a precaution and the children have been sent back and Standard Operating Procedure (SOP) is being followed, authorities said.
Bandra Kurla Police registered a case against an unknown person on Saturday for allegedly sending a threat email to the office of the US consulate general in Mumbai.
Reliance Industries chairman Mukesh Ambani received fresh threat emails, warning him of serious consequences for ignoring previous messages of Rs 400 crore as extortion demand, Mumbai police said on Saturday.
Reliance Industries Chairman Mukesh Ambani has received fresh death threats via email threatening to shoot him if he fails to pay Rs 200 crore, police said on Saturday.
According to the Mumbai police, it was written in the threatening email that "If you don't give us 20 crore rupees, we will kill you, we have the best shooters in India."
According to the local police, an email was received by the Airport Operations Control Center (AOCC) alleging that a passenger planned to hijack a flight travelling from Air India in Hyderabad to Dubai.
"The Indian School in Sadiq Nagar received a bomb threat via email. As a precautionary measure, the school has been vacated. Bomb Detection and Disposal Squad informed", informed the police officials.