Multiple people were wounded, some suffering life-threatening injuries, after a woman allegedly stabbed travelers with a knife on Friday at Hamburg Central Station in Germany.

The 39-year-old woman, who has not yet been publicly identified, was arrested shortly after the attack without incident, Hamburg Police announced on X.

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Officials believe the woman acted alone, but the motive is unknown.

“Investigations into the background are in full swing,” police said.

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The attack happened in the late afternoon inside the station on the platform between tracks 13 and 14, according to a report from the Associated Press. 

Hamburg’s fire service said six people suffered life-threatening injuries, three people were seriously injured, and three others had slight injuries, German news agency Deutsche Presse-Agentur reported.

However, police later said the number was not firm, only confirming “several” people had life-threatening injuries, according to the AP.

State-owned railway company Deutsche Bahn posted to X saying they were “deeply saddened” by the act of violence.

Tracks 11 to 14 at the main station were closed, and delays and diversions were announced for long-distance trains.

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“We are fully supporting the authorities in their investigations on site,” Deutsche Bahn wrote in a post.

Police confirmed a “major” operation is currently underway.

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More than 550,000 travelers pass through Hamburg’s main station each day, making it the most frequented passenger railway station in Germany, according to its website.

The station, which opened in 1906, is just a short walk from the city center and features 75 shops and restaurants.

In February, one person was seriously injured in a stabbing at Berlin’s Holocaust memorial near the U.S. embassy.

On Wednesday, Elias Rodriguez, of Chicago, was charged with killing two Israeli Embassy staffers during a shooting at an event hosted by the American Jewish Committee in Washington, D.C.

The Associated Press contributed to this report.