This River flows to close the case

River, an 18-month-old yellow Labrador, has joined the Massachusetts State Police Fire and Explosion Investigation Unit as an accelerant-detection dog. Trained for more than six weeks at the ATF’s National Canine Training Center, she will work with her handler, Trooper James Colella, and partner agencies to investigate fires with unknown or suspicious causes. State officials say the dog strengthens the State Fire Marshal’s investigative team.