An 85-year-old Moscow woman was detained on suspicion of having stabbed to death a 71-year-old woman with whom she lived in a communal apartment in southwestern Moscow, the Interfax news agency reported, citing an unnamed source in law enforcement.
The two women reportedly got into a fierce argument, which culminated in the octogenarian stabbing the septuagenarian three times in the chest.
The other residents of the communal apartment called an ambulance. The stabbed woman reportedly succumbed to her injury after paramedics arrived on the scene.
It remains unclear what prompted the 85-year-old woman to pull a knife on her neighbor.
A murder case has been opened into the incident, Interfax reported.