Four women and a 9-year-old boy were killed and 200 people were injured when a man drove into a Christmas market teeming with holiday shoppers in the German city of Magdeburg — an attack that has left Germans mourning the victims and with a shaken sense of security.

Police say the driver is under arrest after plowing into the crowd at a Christmas market in Magdeburg, Germany, killing at least five people - including a 9-year-old - and injuring 200 others.