Seven states, including all south Indian ones, were put on alert late on April 25 after the Bengaluru police received a tip-off about a possible terror attack on multiple cities and the gathering of a group of terrorists in Tamil Nadu’s Ramnathapuram, reports Hindustan Times. A caller claiming to be a lorry driver said major cities in Tamil Nadu, Karnataka, Kerala, Andhra Pradesh, Telangana, Goa, Maharashtra and Puducherry would be hit by terror attacks… (which) will take place on trains, said the letter issued by Karnataka director general of police to the states mentioned in the tip. “He also claimed that there are 19 terrorists present at Ramanathapuram, Tamil Nadu,” the letter added.