Newton, often billed as one of the safest cities in America, fired its police chief Thursday for “conduct unbecoming” ­after an investigation found that he made boorish and in­appropriate comments to women on the force.

Mayor Setti Warren notified Chief Matthew Cummings that he had been fired following a six-hour dismissal hearing Wednesday. Cummings had been chief since 2009, but was with the department for more than 30 years. He earned a salary of $168,737 last year.