Updated

New York City officials have taken the first step in appealing a federal judge's ruling that imposes reforms on the police department's stop-and-frisk strategy after she found that the policy intentionally singled out minorities.

The city Law Department filed a notice of appeal Friday in U.S. District Court in Manhattan. Lawyers have about three months to file the formal brief.

Judge Shira Scheindlin issued her decision Monday. The ruling found that the New York Police Department was making the street stops based on race and called for an independent to monitor make sure police follow measures restricting the program.

Mayor Michael Bloomberg calls the ruling unfair and warns that it will damage the NYPD's successes in fighting violent crime.