A three-year-old boy has died after becoming trapped in a family car in Saint-Gratien, in the Val-d'Oise département north of Paris, as France swelters in record-breaking heat - the third such death this week, the Pontoise public prosecutor announced on Thursday. ADVERTISEMENT ADVERTISEMENT The child had climbed into the car while his father believed he was napping. He was unable to get out because the child lock was engaged, the prosecutor's office confirmed, corroborating information from