The Maine Drug Enforcement Agency arrested four people in Paris on Tuesday for their alleged roles in a heroin trafficking operation.

Jacolby Morrison, 18, of Norway and Jonathan Keefe, 27, of Wakefield, Massachusetts were each charged with aggravated trafficking in schedule W drugs. Morrison was also charged with violation of administrative release.

Laurie Jones, 52, and her son, Jared Jones, 22, both of Norway, were each charged with unlawful possession of schedule W drugs.

The investigation began after the heroin-related overdose death of an 18-year-old woman in Norway on September 12, 2015, Maine Department of Public Safety spokesman Stephen McCausland said in a news release on Wednesday.

During the investigation, drug agents identified several associates of the victim who were suspected of distributing heroin in Oxford County, McCausland said.

On Tuesday, investigators conducted surveillance of Laurie Jones' apartment on High Street in Paris. Her residence was suspected of being used by Morrison and Keefe to distribute heroin. The two frequently traveled to Massachusetts to purchase drugs that were later distributed in Maine, the release said.

Later in the day, the MDEA, Maine State Police and other local law enforcement agencies raided the home, recovering approximately 80 grams of heroin, scales, packaging materials and $1,600 dollars of suspected drug proceeds.

Earlier this year, agents say they were able to make undercover purchases of heroin from Morrison, who was subsequently arrested for trafficking the drug and was out on bail when he was arrested again on Tuesday.

The four suspects were transported to the Oxford County Jail. No bail was allowed for Morrison, Keefe’s bail was set at $25,000 cash and bail for Laurie and Jared Jones was set at $500 each.