🚨#BREAKING: Watch dramatic footage showing the moment a gunman could be seen waving around a weapon before opening multiple rounds along a busy street 📌#Cambridge | #MassachusettsWatch wild footage captured by a nearby witness showing the terrifying moment 46-year-old Tyler Brown, who reportedly has a criminal history spanning nearly 20 years including prior firearm and drug convictions, opened fire along busy Memorial Drive in Cambridge Massachusetts Monday afternoon, triggering a massive pol