An iPhone app called ICEBlock allows users to anonymously report sightings of US Immigration and Customs Enforcement (ICE) agents, and it has become one of the most downloaded free iPhone apps in the US after criticism from US Attorney General Pam Bondi. The app does not collect or store any user data, according to TechCrunch's analysis. The app's developer has stated that they will not release an Android version due to privacy concerns. The app's popularity has sparked a discussion about privacy, security, and government surveillance.