New Delhi, Oct. 5 -- Apple and Google blocked downloads of phone apps that flag sightings of U.S. immigration agents, just hours after the Trump administration demanded that one particularly popular iPhone app be taken down.

U.S. Attorney General Pam Bondi said such tracking puts Immigration and Customs Enforcement officers at risk. But users and developers of the apps say it's their First Amendment right to capture what ICE is doing in their neighborhoods - and maintain that most users turn to these platforms in an effort to protect their own safety as President Donald Trump steps up aggressive immigration enforcement across the country.

ICEBlock, the most widely used of the ICE-tracking apps in Apple's app store, is among the apps tha...