As Omicron cases continue to grow in India, the government has issued new travel rules for passengers arriving from "at-risk" nations. From Monday onward, travellers arriving at international airports across six major cities in India will be required to pre-book their RT-PCR tests. These airports include Mumbai, Delhi, Chennai, Kolkata, Hyderabad and Bengaluru. As per reports on Monday, India's Omicron tally has touched 171, with Maharashtra and Delhi recording the highest number of cases. A majority of cases have had travel history from at-risk nations or came in contact with those who did.