Pittsburgh's police chief has closed his Twitter account and asked for a city investigation to determine if he broke regulations after he was photographed on New Year's Eve holding a sign saying, "I resolve to challenge racism @ work" with the hash tag "end white silence."
A city spokeswoman says Chief Cameron McLay made the decisions after a meeting Wednesday with Fraternal Order of Police President Howard McQuillan.
McQuillan has said the sign painted city police as racists and violated a policy governing police social media participation.
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Mayor Bill Peduto praised McLay for recognizing that racism exists and acknowledging there's work to be done restoring trust between the city's police and the black community.
A protester brought the sign to the city's First Night celebration. McLay was hired in September.