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The latest deadly assault on a beloved German tradition illustrates the challenge of holiday safety. For years, Germany has been strengthening security measures around Christmas markets in reaction to an attack in 2016 in which a man killed 12 people by driving a truck into a market in central Berlin.

At least five people, including a 9-year-old, are now known to have been killed in the vehicle-ramming attack on a Christmas market in the German city of Magdeburg on Friday, German officials said Saturday.

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.

Germany's interior minister said on Monday it was still too soon to jump to any conclusions about the man suspected of driving his car into a Christmas market in Magdeburg and killing at least five people.

German security and intelligence chiefs faced questioning Monday about the car-ramming attack that killed five people and wounded more than 200 at a Christmas market 10 days ago.