Authorities said the teenage couple killed family members in multiple locations, named as Quentin Thompson, 21; Devin May, 24; Shania Thompson, 25; Cherie May, 49; and Patricia May.

Police and prosecutors declined to name the 16- and 15-year-olds, or even reveal their genders, a day after their capture in East St. Louis.

Two teenagers, ages 15 and 16, are in custody.