ICEBlock allows its users—of which there are over 30,000, according to the app's developer—to upload sightings of ICE activity. They can pinpoint the location on a map, and of

The Waze-inspired cell phone application seeks to warn migrant communities about the presence of ICE officers amid the rise in deportations

Joshua Aaron, a musician and developer, created an app called ICEBlock, where people can post sightings of U.S. Immigration and Customs Enforcement officers across the country. CNN’s Clare Duffy speaks to Aaron about what motivated him to create the application and the efforts he has made to keep it accurate and prevent it from identifying users.