VERNON, Vt. — Law enforcement officials have come up dry after two days of searching the Connecticut River for signs of a missing Chesterfield mother and daughter.

Tina and Bethany Sinclair were last seen in February 2001. They were living at the home of Tina Sinclair’s boyfriend Eugene Van Bowman, at 182 Mountain Road, which overlooks the river. Bowman has never been charged in connection with the disappearance, and has declined numerous requests for comment.

The N.H. Attorney General’s Office announced Tuesday it would partner with several other law enforcement agencies to search the river near the Vermont Yankee nuclear power plant in Vernon, Vermont. Assistant Attorney General Benjamin J. Agati said Tuesday search teams were using sonar and imaging techniques that either didn’t exist in 2001, or weren’t commercially available.

Members of the New Hampshire Fish and Game Dive Team, the New Hampshire State Police Marine Patrol Unit, the New Hampshire Cold Case Unit, the Massachusetts State Police Underwater Recovery Team and the Vermont State Police Scuba Team partnered for searches Tuesday and Wednesday.

Agati said Wednesday afternoon that while they came up empty, authorities would examine data and images to determine if they should conduct additional searches in that area.