ICEBlock is an iPhone app for anonymously reporting ICE agent sightings.
The app went viral and reached top free iPhone app rankings after US Attorney General Pam Bondi criticized it.
About 20,000 users in Los Angeles are using the app amid frequent ICE raids.
ICEBlock legally allows users to share ICE locations within 5 miles and sends proximity notifications.
The app does not collect or store any user data, confirmed by TechCrunch network traffic analysis.
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