At about 1: 37 AM on Tuesday, January 9, 2018, officers from District B-3 (Mattapan) were on patrol in the area of 5 Ames Street due to several recent firearm related incidents. The officers, who were in full uniform operating a marked BPD cruiser, observed a male walking on Westview and take a right onto Ames Street. While watching the officers pass by him, the suspect abruptly changed direction in order to avoid the officers. Given the male’s unusual behavior and the recent history of incidents in the area, officers attempted to stop the individual; however, the male hurried toward the front steps of the BHA building at 5 Ames Street. Officers followed the male and observed him sprint through the hallway and out a back door into a courtyard. Officers were able to approach him in the courtyard to have a conversation. At the same time, additional officers canvassed the short flight path for any discarded items. Officers immediately observed a loaded black semi-automatic firearm in a snowbank a short distance from the male. Through further investigation, officers were able to determine that the firearm had very recently been put in the snow. Officers identified the male as a 17-year-old juvenile from Mattapan and placed him under arrest. The juvenile was charged with Trespassing, Unlawful Possession of a Firearm (2nd and Subsequent Offense), Unlawful Possession of Ammunition, Unlawfully Carrying a Loaded Firearm, and Unlawful Possession of a Large Capacity Feeding Device.