BOSTON -- Police continue to investigate a sophisticated drug operation found inside the Maine home of a Boston firefighter on Friday.

NewsCenter 5’s Lynn Jolicoeur reported that police seized $700,000 worth of marijuana plants and growing equipment at the Bridgton, Maine, home of firefighter Sean Berte, who resigned Saturday following the raid.

Berte's father-in-law, Michael S. Domenici, 60, of Rehoboth, Mass., was arrested and charged with cultivation of marijuana.

Berte, who was working a shift in Boston when the raid took place, was questioned and released by federal Drug Enforcement Administration agents. Maine authorities listed Berte as a person of interest in the drug discovery, but he has not been charged.

A lawyer representing Berte said Sunday that he and his family are “concerned” about the situation.

“I’m sure that there’ll be some action taken by the government and we’ll be prepared to cooperate and present ourselves at the appropriate forum,” said attorney Philip Tracey Jr. Sunday.

Berte declined to answer questions about the situation at his Massachusetts home on Sunday. Fire department spokesman Steve MacDonald declined to comment on the raid, citing the fact that Berte is no longer employed as a firefighter.

“He’s not on our job anymore. He wouldn’t be in our fire houses anymore. …It’s really a police investigation,” said MacDonald.

Berte, 31, was assigned to ladder 17 on Columbus Avenue before he resigned. He was hired by the fire department in 2001.

Police seized 131 marijuana plants in the raid, along with chemicals and fertilizers used to grow the plants, according to Bridgton Police Chief David Lyons.

"This operation was sophisticated, well-organized," Lyons said. "This guy had it down to a science."

Bridgton police have been working with DEA agents, and an investigation led to Berte's home, Lyons said. This was the fourth major drug bust in Bridgton this year.