The Washington Post via Getty Images

The release of the tapes came two days after authorities charged Monifa Sanford and Zakieya Latrice Avery with killing two of Avery’s children (ages 1 and 2) and injuring two others (ages 5 and 8).

Police in Germantown, a suburb of Washington D.C., were initially called to home of the two women Thursday after receiving a 911 call about an unattended child in a vehicle. When they arrived, the child was gone. They returned to the home Friday after a neighbor called 911 after noticing a bloody knife near a car with its door left open.

Inside the home, police found the two murdered children. They had received multiple stab wounds.