NEW YORK (AP) — Muslim groups and civil liberties advocates applauded the decision by New York Police Department officials to disband a controversial unit that tracked the daily lives of Muslims as part of efforts to detect terror threats, but said there were concerns about whether other problematic practices remained in place. In a statement, Mayor Bill de Blasio, a Democrat, called the move "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." Since taking office, de Blasio has taken other steps toward changing how the police department operates, like ending the city's appeal of a judge's ruling ordering major reforms to the department's implementation of a controversial street stop policy including the implementation of the first-ever inspector general for the NYPD. After a series of stories by The Associated Press detailing the extent of the NYPD's surveillance of Muslims, two civil rights lawsuits were filed challenging the activities as unconstitutional because they focused on people's religion, national origin and race. The Center for Constitutional Rights in New York and the California-based Muslim Advocates, which represented eight Muslims in a 2012 lawsuit challenging the spying program, welcomed the unit's dismantling but expressed concern it wouldn't stop the surveillance in Muslim communities.