FILE PHOTO: Residents stand guard next to the barricades which they have used for blocking the road connecting to Nizamuddin area where hundreds were taken away to be quarantined amid coronavirus disease (COVID-19) fears, in New Delhi, India, April 1, 2020. REUTERS/Danish Siddiqui
NEW DELHI (Reuters) - It was late on Sunday night when officials in the southern Indian state of Andhra Pradesh received the alert. Federal authorities said they needed to track down more than 1,000 people linked to a large Muslim missionary gathering nearly 2,000 km away in the capital New Delhi.
Authorities in Andhra Pradesh, a region of about 50 million people, used cell phone towers, government databases and even village volunteers over the next five days to find almost everyone on the list -- from attendees to the people they had been in close contact to fellow travellers.
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