A three-year-old has died after finding himself trapped in a car in the Paris region in extreme heat, a prosecutor said on Thursday, the third such fatality this week. The boy had slipped into the family car while his father thought he was napping, then found himself unable to get out with the child lock in the town of Saint-Gratien, the prosecutor said, after a police source and civil defence also reported the death. France on Wednesday recorded the hottest day since measurements began in 1947,...