The search for a missing developmentally disabled Manassas girl expanded Thursday as it headed into its second day, Prince William County police said.

Thirteen-year-old Alexis Glover was with her mother, Alfreedia Glover, in the Central Library parking lot at 8601 Mathis Ave. around noon Wednesday when she slipped away, police said. Alexis is emotionally and mentally disabled, and has medical issues.