A 10-year-old boy and a 35-year-old man died Monday from severe injuries sustained in gas explosions at a food stall last Thursday at a summer fireworks festival in Kyoto, becoming the second and third fatalities from the accident, police said.

Sora Yamana was taken to the intensive care unit of a local hospital after two explosions at one of the festival's stalls inflicted severe burns all over his body just before the start of the fireworks show in the city of Fukuchiyama around 7:30 p.m., the police said.

Yamana, a fifth-grader, had gone to the riverside festival venue with Hiromi Takeuchi, 44, an acquaintance of his grandparents, who died Saturday after suffering major burns in the blasts.

Meanwhile, Naoki Kuroda, who was visiting Fukuchiyama from Osaka Prefecture to watch the event, died Monday at a hospital in the city of Kyoto.

In addition to the fatalities, 57 people were injured, including the 38-year-old stall operator, who suffered serious burns after gasoline he is believed to have taken to the site in a can sprayed out and ignited, the police said.