Beginning at 4 AM, on July 16, 1942, French authorities instructed French police to round up and arrest as many Jews as possible within Paris. They arrested more than 13,000.

Each person was instructed to bring one blanket, one sweater, a pair of shoes and two shirts. They were held in extremely crowded conditions at Velodrome d’Hiver, a professional bicycle racing arena one block from the Eiffel Tower. About 6000 were taken to a transit camp and on to Auschwitz the following day, but 7000 remained at Vel D’Hiv in extreme heat without water, food or sanitary facilities. After 5 days, they were taken to three concentration camps near Paris. At the beginning of August, all remaining Jewish adults were taken, leaving the children (ages 16 and under) behind. Over 3,000 children were sent via rail cattle cars to their deaths in Auschwitz from these camps. The youngest was 18 months old.

Further Reading https://www.yadvashem.org/holocaust/france/vel-dhiv-roundup.html

Work in Progress, detail, Vel D’Hiv