Galina Ryabkova, 30, was seen looking emotionless on surveillance video taken from the block of flats in Moscow, Russia, in the moments following the incident.
Neighbours in the complex were alerted after hearing the bodies of the boys, aged 4 and 7, hitting the ground.
One neighbour in the same apartment block described the horrific scenes following the incident to Life News.
The man, who wished to remain anonymous, said his wife woke him up to say that children were falling out of the building.
The man added: ‘Just at that time their mother was leaving the building. We asked her if these were her children and she replied, emotionlessly, “Yes, I threw them away.”’