The mother in western Japan arrested after her two daughters died of heatstroke left them in a parked car while she went to at least three bars with a male friend until the early hours, investigative sources said Saturday.

Maria Takeuchi, 26, was arrested Friday for allegedly leaving her daughters -- Mayuri, 6, and Yurie, 3 -- in a car in Takamatsu, Kagawa Prefecture, for over 15 hours through early Thursday afternoon, when the children were found unresponsive. They were later pronounced dead at a hospital.


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The car in which two preschoolers were found unresponsive and later confirmed dead after their mother left them in the vehicle while she went bar-hopping in Takamatsu, western Japan, is pictured on Sept. 3, 2020. (Kyodo)

While the mother said at the scene that she left the car for about two hours to go to a restroom, footage from surveillance cameras and witness accounts indicate that she left the children around 9 p.m. Wednesday and likely went to at least three bars until the following morning, the sources said.

Takeuchi was sent to prosecutors on Saturday. She has remained silent regarding the allegations, they said.

Investigators said they have questioned Takeuchi's husband about the family's circumstances.

Autopsies found that the girls died of heatstroke, police said. The temperature rose to 37.6 C in Takamatsu on Thursday, a record for the city in September.

The girls had been absent from their kindergarten since the start of September, with Takeuchi telling the principal she was concerned that children who had traveled outside of the prefecture during the summer vacation through the end of August could spread the novel coronavirus and her daughters would return to school on Monday.

Takeuchi served as a member of a parent-teacher association at the kindergarten, according to the principal, who said there were no signs she was abusing her daughters.