According to the department, the incident occurred on January 23.
While preparing dinner, the woman, as well as her two sons and three daughters, felt ill.
The doctors who arrived at the scene decided to hospitalize them.
“On this fact, the investigative department for the city of Mytishchi of the Main Investigative Directorate of the Investigative Committee of Russia for the Moscow Region organized a procedural check,” the department noted, citing a malfunction of the gas water heater as the preliminary cause of the incident.
Earlier, information was received that in Kaspiysk nine people were taken to the hospital with gas poisoning.