Twin baby girls have died of dehydration in France, while their four other siblings have been rushed to hospital. The parents of the 15-month-old tots were on Monday arrested after the girls passed away from suspected dehydration in the northern town of Beuvrages.The couple's other children, aged three, four, five and six, were also hospitalised with dehydration, but their condition is not said to be life-threatening. Emergency services were contacted by the twins' parents after discovering them in their beds, according to local sources. The Mayor of Beuvrages, Ali Ben Yahia, said the community was 'deeply shaken by the tragedy' in a message posted to Facebook. Mr Yahia said: 'This is a family well integrated into the life of our municipality. The children of the fraternity are educated in our schools. 'After a long time living in shared housing, the family had recently moved into a house, with the desire to provide their children with a living environment conducive to their growth.'On behalf of the municipal council and the entire Beuvrageois, I send our most sincere thoughts and all our support to the family and their relatives in this terrible ordeal.' Twin baby girls have died of dehydration while their four other siblings have been rushed to hospital in Beuvrages, France He added that an investigation is 'currently underway' to determine the circumstances surrounding the incident. The deaths come as France faced a spike in deaths last week following its record-breaking heatwave. Public Health France said there were more than 1,200 deaths on Wednesday, when France registered its hottest-ever day, breaking a record that had been set just the previous day.Deaths then increased to more than 1,400 on Thursday and another 1,400 on Friday, the agency said.In comparison, the pre-heat wave death rate in April and May was around 900 to 1,000 per day.This includes several small children who passed away after being locked in cars during the extreme heat. Last Tuesday, an 18-month-old baby died in Marseille after being discovered inside a car in the parking lot of La Timone university medical campus.According to French authorities, the child's parent forgot him in the vehicle on his way to work. France registered its hottest day on record at 44.3C on Tuesday. Pictured: People cooling off at a mist fountain during scorching weather Paris (file image)On Monday, two brothers died from a cardiac arrest around ten minutes after they were left in a car in Carpentras, southern France. (Pictured: The swimming pool the boys visited before their deaths)And on Monday, four-year-old Kassim Benouali, and his younger brother Sadek, two, died from a cardiac arrest around 10 minutes after they were left in a car in Carpentras, southern France.Neighbours heard the screams of their mother Wafa El Boubkari, 33, who discovered their bodies.In the days since, the family has revealed Ms El Boubkari took the boys swimming to cool off and then to a supermarket before returning home to unpack the shopping - and forgot they were in the vehicle.A preliminary postmortem conducted on Tuesday found that the boys died of dehydration from 'exposure to excessive heat'. The ⁠double tragedy occurred as temperatures soared across France - driven by a mass of hot air moving north from the Sahara, fuelled by a strong high‑pressure ​system known as the 'African anticyclone'.Meteorologists say the system is creating a so‑called 'heat dome', trapping hot air over western and central Europe, and ​allowing temperatures to build day after day.On Tuesday, France registered its hottest day on record at 44.3C, while the average nighttime temperature is around 30C - another record high for the country.