Boston’s largest police union says it has hit a wall in its contract negotiations with Mayor Michelle Wu’s administration, teeing up a move to bring talks under arbitration.

“The mayor’s office stopped negotiating and we came to a standstill, an impasse, on the topics that are on the table,” Larry Calderone, president of the Boston Police Patrolmen’s Association, told The Boston Globe on Friday.

According to Calderone, the BPPA went to the bargaining table in June and talks stalled in mid-September.

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