Three schools in Delhi: Sardar Patel Vidyalaya in Lodi Estate, Venkateshwar Global School in Rohini and Salwan Public School in Mayur Vihar, received bomb threat emails on Friday morning, prompting evacuations and search operations. Police, bomb disposal squads and dog squads searched the premises, but no suspicious objects had been found at the time of reporting. An investigation is underway to trace the source of the emails.