At about 8:05 PM on Thursday, March 2, 2017, officers from District A-1 (Downtown) responded to a radio call for an assault and battery in progress in the area of Hamilton Place and Tremont Street.

Upon arrival, officers were informed that the victim was involved in a physical altercation with the suspect, security guard Andrew Pierre, 34, of Boston, during which it is alleged that Pierre drew his firearm from his holster, “pistol whipped” the victim, and pointed the firearm at him. The victim then attempted to flee the assault up Tremont Street. A police officer from the MBTA observed the commotion while patrolling in his cruiser and, believing he was assisting a police officer, ran toward the victim. The victim was compliant while the officer detained him. The officer instructed Pierre to handcuff the victim, but instead Pierre began to kick the victim. It was then that the MBTA officer realized Pierre was not a police officer giving lawful orders, but a security guard, and ordered Pierre to stand back. Responding Boston police officers were able to view surveillance footage that corroborated the information provided to them.

Officers arrested Pierre and charged him with Assault and Battery by Means of a Dangerous Weapon (Shod Foot) and Assault by Means of a Dangerous Weapon (Firearm). During a search of Pierre, officers recovered a loaded Smith & Wesson M&P .40 caliber from his holster and a loaded Ruger SR40 firearm from his pocket. Upon further inspection of the firearms, officers observed the ammunition had been loaded backwards in all four magazines. Officers also seized a Sabre stun gun, an expandable baton, two small canisters of pepper spray, and a large Sabre MK9 fogger. Officers seized Pierre's license to carry and two security badges.