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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.

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.