Prospekt Mira
Biryukov kidnapped and murdered his first victim on 16 September 1977, when he stole a stroller that had been left briefly unattended in front of an infant formula store on Marshal Biryuzov Street in Moscow. Later that day, the missing stroller was found empty and the baby was found dead in the hallway of an apartment building on the same street. Three days later Biryukov kidnapped his second victim, a three-month-old girl, when he seized a stroller from in front of the Children's World store on Prospekt Mira. The authorities began to suspect that they had a possible serial perpetrator, and launched one of the largest operations in Moscow police history looking for the missing baby. On October 17, the body of Biryukov's second victim was found in a landfill near Mamyrov, a village on the outskirts of Moscow. She showed signs of having suffered sexual assault before death.