Three people were arrested in connection with a home invasion in Unity in the middle of the night Tuesday.

Maine State Police are searching for a fourth person involved in the incident on Wanning Road.

State Police said three men forced their way into the home of a 72-year-old woman who woke at 1 a.m. to find the men dressed in dark clothing in her bedroom demanding money and drugs.

The woman was not hurt and was able to call the police emergency line after the men left with cash and her cellphone.

State police said the  intruders had bought gloves, bandannas and zip ties before the robbery, although the woman was not tied up.

Arrested and taken to the Waldo County Jail were:

• Paige Lanctot, 19, of Skowhegan, charged with criminal conspiracy. She is free on $1,000 bail.

• Alexander Salvas, 19, of Skowhegan, charged with burglary and robbery. He is being held on $5,000 bail.

• Bryan Gower, 22, of Waterville, charged with burglary and robbery. He is being held on $5,000 bail.

Lactot and Salvas were arrested Tuesday in Skowhegan and Gower was arrested on Friday in Watervile.

Police are seeking Danny Green, 27, of the Waterville area, who will be charged with robbery and burglary.

He is described as a transient, 5-foot-8, 165 pounds with blond hair and hazel eyes.

Anyone with information about his whereabouts is asked to contact the state police at 624-7076.