Five people were injured in a knife attack in central Amsterdam, Dutch police said.
Police said the suspect has been arrested and an investigation into the motives for the attack is underway.
Police said they quickly arrived at the scene and soon arrested the suspect, Reuters reports.
Dutch authorities said the victims included a 67-year-old woman and a 69-year-old man, who are American citizens.
The other injured are a 26-year-old man from Poland, a 73-year-old woman from Belgium and a 19-year-old woman from Amsterdam.
"The motive for the attack is currently unclear and under investigation. Police are considering the possibility that the suspect may have targeted the victims at random, but the exact motive remains unknown," police said in a statement.
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