Authorities say they have found the bodies of a missing Tennessee mother and her 14-year-old daughter in Mississippi, while her two other daughters may still be with an alleged abductor.

  The FBI said in a news release late Monday that the bodies of Jo Ann Bain and her 14-year-old daughter Adrienne Bain have been positively identified. 

The FBI said it believed Bain's two other daughters -- 12-year-old Alexandria and 8-year-old Kyliyah -- were still with alleged kidnapper Adam Mayes. The agency did not say in a news release why it thought that. Mayes may be using two different aliases, the FBI said.

  The FBI says the bodies were found behind Mayes' residence near Guntown, Miss.

Mayes was last seen a week ago in Guntown, about 80 miles south of the Bain family's home in Whitesville, Tenn.

Kidnapping warrants have been issued for Mayes. The Mississippi Department of Public Safety said Saturday it believed "the children may be in extreme danger."