Cambridge police defend sergeant’s actions in video-recorded encounter

An internal investigation into a Cambridge police sergeant who detained a Dorchester man for allegedly bumping into him found no wrongdoing, the department said in a statement posted online Tuesday.

Responding to a Globe story published Tuesday morning and to video of the incident in Porter Square, the Cambridge Police Department statement said Detective Sergeant Thomas Ahern’s “actions were consistent with his duty obligations.”

Read the complete story at BostonGlobe.com.

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