Five out of Parma, Missouri’s six police officers resigned this week before Tyrus Byrd, the town’s first African-American, female mayor, was sworn in. The city’s attorney, clerk, and waste water treatment plant supervisor also resigned, KFVS12 reports.

According to KFVS, The outgoing Mayor Randall Ramsey said that the city officials cited “safety concerns” in their letters of resignation. Mayor Byrd, who had previously served as the city clerk, won the election by 37 votes. (The population of Parma was 713 at the 2010 census.)

KFVS reports that after Byrd was sworn in on Tuesday, “the resignation letters cannot be found and that the computers were cleared.”

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