The woman who arrived first in an ambulance to the house on Petropavlovska Borshagovka was taken into custody - Budanov. She wore a paramedic's uniform and used a purchased ambulance. In the past, together with the driver, I toured the place three days before the event. It was found that the detainee corresponded with Telegram channels, which later actively spread information about the incident. The reasons for her actions are still unknown. Personal motives, anti-state activity and possible financial interests are considered. The victims who needed medical treatment were hospitalized. The other residents of the house usually did not need treatment.