Two adults have been arrested in the homicide investigation of New Glasgow teenager Amber Kirwan, Nova Scotia RCMP say.

Police have not said who they are or when they were taken into custody.

A news conference has been scheduled for Thursday morning at 9 a.m. at the New Glasgow Police headquarters to provide a "significant update" in the Kirwan case, said RCMP.

The chief of the New Glasgow Police Service and the RCMP officer in charge of policing in northern Nova Scotia are expected to attend the news conference.

Marjorie Kirwan, Amber's mother, told CBC News it was a "bittersweet moment" when she found out about the arrests.

"At the end of the day, Amber's still gone," she said Wednesday night from her home in Stellarton.

"We've had faith in the police from day one. We knew this day would come. So it doesn't come as a surprise, it's just a matter of waiting and patience."

Kirwan's remains were found on a property in Pictou County in November. At the time, RCMP confirmed it was a homicide but didn't say how the 19-year-old died.

The wooded area off Heathbell Road — where Kirwan's body was found — is about a half-hour drive from Dooly's pool hall in New Glasgow where the teenager was last seen.

She had told friends Oct. 9 at about 1:30 a.m. she was leaving to meet her boyfriend, Mason Campbell, at a convenience store nearby.

Campbell told police she never arrived for the meeting.

The discovery of Kirwan's remains ended a four-week search for the young woman. Police officers and dozens of community members scoured the area for Kirwan or any clue to her disappearance.

Marjorie Kirwan said she doesn't know who has been arrested in her daughter's case, but said police have been keeping her family updated on the investigation.

"It's all about justice for Amber in the end," she said.