Punjab Police have been put on high alert after five prominent temples, including the Durgiana Temple in Amritsar, received bomb threat emails days ahead of the 42nd anniversary of Operation Bluestar. Besides Durgiana Temple, bomb threats were received by Mukteshwar Dham Temple in Pathankot, Devi Talab Mandir in Jalandhar, Maisar Khana Temple in Bathinda and Mata Kali Temple in Patiala.