New Delhi, Aug. 18 -- Several schools in the national capital received emails on Monday from a group identifying itself as the "Terrorisers 111 Group." The messages demanded a payment of $5,000 in cryptocurrency within 72 hours, warning that bombs would be detonated on school premises if the demand was not met, said an official.

According to Delhi Police, the email read, "Pay $5,000 USD Crypto within 72 hours. If you don't, we will detonate the bombs."

The message to the school administration stated: " We are the terrorisers 111 Group. We have planted several pipe bombs and advanced explosive devices in your school buildings to cause terror and destruction. We have hacked your IT systems, including student and staff databases, and taken...