The New York Police Department has disbanded a secret programme designed to eavesdrop on Muslims to identify potential terrorism threats.
The Demographics Unit had dispatched plainclothes detectives to listen to conversations and build files on places frequented by Muslims, US media say.
The squad had been the subject of two federal lawsuits in the past, and drew ire from civil rights groups.
It is also said to have sowed Muslim mistrust for law enforcement.
“This reform is a critical step forward in easing tensions between the police and the communities they serve, so that our cops and our citizens can help one another go after the real bad guys,” the office of New York City Mayor Bill de Blasio wrote in a statement.
The decision to stop the programme was reportedly made by new Police Commissioner William Bratton, and is viewed as a moving away from past intelligence gathering practices instituted after the 9/11 attacks.
The unit – in operation since 2003 and later renamed the Zone Assessment Unit – logged where Muslims worked, shopped, ate and prayed.