An outside investigation into the Haverhill Police Department is set to begin this week, with an attorney appointed by Mayor Melinda Barrett overseeing the review.

In a statement Thursday, Barrett also provided details about the scope of the investigation, which will be limited to issues with leadership recently raised by the city’s two police unions. It will not include an examination of the July incident where a man died while being restrained by Haverhill police officers.

The investigation comes on the heels of a tumultuous week for the department. Chief Robert Pistone was placed on leave last week before abruptly retiring . Deputy Chief Stephen Doherty Jr. was briefly named acting chief, but was also placed on leave . The Haverhill Police Patrolman’s Association issued a vote

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