MWS update at July 15, 2023 at 03:02PM

SAT at 3pm: trying to get more info on the two low flying helicopters that followed the merrimack through north Chelmsford then headed south along route 3. Appeared to be commercial helos but they aren't transmitting on ADS-B anything useful, so could be military or federal. More info: https://ift.tt/1UXDfSw