At about 2:30 PM on Thursday November 17, 2016, officers assigned to the Youth Violence Strike Force made an onsite firearm arrest after performing a traffic stop in the area of 10 Wendover Street in Dorchester. Officers were on directed patrol in response to recent gang related activity when they observed an improperly registered motor vehicle travelling on Wendover Street. When the officers activate their lights and sirens, the vehicle pulled over and stopped at which time the passenger, Ali Rosa, 36, of Dorchester, who was known to the officers, immediately opened his door and tried to walk away. Officers stopped the suspect and performed a pat frisk which led to the recovery of a loaded .22 caliber (LR) Jennings model J-22 handgun with an obliterated serial number from the suspect’s waistband. Officers also recovered two bags of crack cocaine and thirteen bags of marijuana packaged for sale from the suspect. Officers later learned that the operator of the vehicle, Fredwilson Vaz, 19, of Roxbury, was operating with a suspended license. Both suspects were placed in custody without incident and will appear in Roxbury District Court. Ali Rosa will be charged with Unlawful Possession of a Firearm, Unlawful Possession of Ammunition, Carrying a Loaded Firearm, Possession of a Firearm with an Obliterated Serial Number, Armed Career Criminal and Possession with Intent to Distribute Class D & B Drugs. Fredwilson Vaz will be charged with Operating a Motor Vehicle After Revocation or Suspension, Operating an Unregistered Motor Vehicle and Attaching the Wrong Plates.