Officer stabbed in Mattapan, juvenile in custody The officer is being treated for non-life threatening injuries. Email A Boston Police Officer was stabbed by a juvenile in Mattapan on Wednesday evening, according to the Boston Police Department. Police said the officer was stabbed around 5:13 p.m. near the area of 1234 Blue Hill Avenue, and a juvenile suspect in custody. Police added the officer is currently being treated at the hospital for non-life threatening injuries. Newsletter Signup Submit your email