At least six Delhi schools received a bomb threat on Saturday, officials said, marking the third instance of threat emails being sent to schools in the national capital this week. Meanwhile,  the Delhi Police Special Cell has identified a private school student responsible for sending a bomb threat email to a school in Paschim Vihar. According to the Special Cell, this individual is not connected to the group bomb threat emails sent to many schools in Delhi on Friday.

"We received a call about a bomb threat at Delhi Public School, RK Puram, at 6:09 am," a Delhi Fire Services official said. The fire department, local police, dog squads and bomb detection teams reached the school and launched a search operation, the official said. Five more schools, including Ryan International School in Vasant Kunj and Gyan Bharati School in Saket, received the same email from the same sender, he further said.

A police official said nothing suspicious was found after search and inspection in any of the schools. The mails were sent from the "childrenofallah@outlook.Com" email id at 1:47 am.

According to a source, the email read, "Allah sees your efforts to resist his punishment. But they are futile. For no mortal being can escape the judgement of Allah. The Prophet Muhammad declares all who go against Allah enemies to the world. We see your attempt to stop us. It will not work. The Prophet Muhammad has allowed the children to burn in the sacred flame of Allah."

"On Saturday where students may not be there in your buildings is when the buildings shall be brought down. Our bomb vests are blessed by the Prophet Muhammad. They shall not fail their goal. Our children are brave servants of Allah. They shall complete their task," the source said quoting the email. On Friday, about 30 schools received bomb threats over email, triggering a multi-agency search of their premises. Prior to that, at least 44 schools received similar emails on Monday. The police had declared those threats as hoaxes after nothing suspicious was found during searches.

According to police, the student who had sent the threat email to his own school in Paschim Vihar, and after tracing the IP address, the police team traced his home. Upon questioning, the child admitted to the act and was later counselled. The boy told police that he sent the mail after seeing media reports about several schools in Delhi getting bomb threats. He believed that he would not get caught as none of the accused in the earlier cases had been caught yet, the source said. He was let off with a warning to his parents to keep a watch on his behaviour.

The threatening emails raised concerns among parents and staff, though the police assured that investigations are ongoing and safety remains their priority. No explosives or hazardous materials have been found in any of the schools so far.

Since the beginning of the year, around 300 bomb threats have been made to different schools, sending parents, children, cops and administrators into a tizzy. However, the Delhi police seem helpless in tracking down the perpetrators as most of these communications were made using tools like virtual private networks (VPNs) or the Onion Router, aka Tor, which helps mail users remain anonymous. On Friday, the person who sent bomb threat to six schools on Friday used a New Zealand-based email service.

Police used advanced tech and pressed into service specialized cybercrime units like CIU (Counter-Intelligence Unit) and IFSO (Intelligence Fusion & Strategic Ops), but the were far from making a breakthrough.