Critics warn that India’s new national contact tracing app, downloaded by over 100 million people, is just the latest move in the country’s drive to establish an increasingly draconian surveillance state.

Prime Minister Narendra Modi’s government launched the app, named Aarogya Setu — Hindi for “Bridge to Healthcare” — on April 2.

The app is designed to provide information about the Covid-19 crisis, allow individuals to report their symptoms and, using Bluetooth, alert users to the risk of contact with infected people. It also reports the number of suspected infections within a radius of 500 meters to 10 kilometers.

But opponents believe it is part of a wider plan to track and monitor residents stretching back more than a decade to the introduction of Aadhaar, the nation’s controversial biometric identification system.