AYER -- A months-long investigation by Littleton police, with assistance from Ayer police, led to a 40-year-old Shirley woman being charged with trafficking cocaine, and a 47-year-old Ayer woman being charged with drug distribution, according to police.
Littleton police said the arrests were the result of an investigation into drug activity at 188 Littleton Road, in Ayer -- a home located close to the town line.
Police said they were conducting surveillance on that address Thursday, when they decided to stop vehicles driven away from the home by two women as a result of activity observed by officers, as well as information gathered previously during the probe.
The first arrest came as Katherine Shipton, of Shirley, drove away from the home about 12:30 p.m. After a "brief pursuit" on King Street in Littleton, Shipton stopped her vehicle for police, according to press release.
Police found over 40 grams of cocaine and several hundred dollars in cash when a Littleton police canine K-9 helped search the vehicle, according to police.
Shipton was charged with trafficking cocaine and failure to stop for police, according to police.
About two hours later, police stopped Dawn Flynn, of Ayer, as she too drove away from 188 Littleton Road in Ayer. She too was stopped on King Street in Littleton. Police said a search of Flynn's vehicle turned up four grams of heroin, a gram of cocaine, and cash.
Flynn was charged with possession with intent to distribute cocaine and possession with intent to distribute heroin, according to police.
Both women are expected to be arraigned Friday in Ayer District Court.
Follow Robert Mills on Twitter @Robert_Mills