A 4-year-old boy and his 4-month-old sister died early Monday from burns suffered Sunday in a car fire in a Kyoto parking lot in which their 2-year-old sibling was also seriously injured, police said.

Police said Takahiro Maeda and his infant sister, Ayumi, died from burns they and their 2-year-old sister, Miyuki, suffered in the blaze inside the car while it was parked in Joyo, Kyoto Prefecture, at around 12:55 p.m.

Their 30-year-old mother, Yumiko, from the city of Uji was shopping when the fire broke out, police said, adding they found a matchbox and matches on the back seat of the car.

The 2-year-old was still in critical condition as of Monday morning, police said.