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.Related coverage:Young sisters dead after being left in car for hours, mother arrestedREAD FULL ARTICLE