The Delhi Police claimed on Tuesday that a Class-12 student, who was recently apprehended for allegedly sending bomb threats to more than 400 city schools, is linked to an NGO that supports a political party. A police officer further said that during the investigation, they also got to know that the NGO had voiced support to Parliament attack convict Afzal Guru. "We were tracking e-mails and because of a virtual private network (VPN), it was difficult to track the origins. We also had to ascertain whether there was a terror angle to it," Special Commissioner of Police (Law and Oder) Madhup Tewari told a press conference at the police headquarters here. He added that service providers were not able to help police because of the use of the VPN. "Our teams tracked the minor after recent e-mails on January 8. As the e-mail sender was a juvenile, the team took his laptop and mobile phone for a forensic examination," the officer said. Police teams tracked 400 threat e-mails sent by the