At least three people were injured in a stabbing incident in a busy shopping area of The Hague, Netherlands, on Friday, police said.
The man, reportedly of Middle Eastern or North African descent allegedly stabbed three minors in a department store during the Black Friday sales rush.
National broadcaster NOS said the attack could not immediately be attributed to terrorism.
Police cordoned off the area overnight as forensics experts combed the street for clues.
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A police spokesperson told local media that the youngest victim is a 13-year-old boy from The Hague. Police said in a statement that the teens didn't know one another.
"Stabbing incident with multiple wounded on the Big Market Street in The Hague".
Many videos were posted online which showed shoppers on the busy street running away frantically from the incident.
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"We are still looking for the perpetrator", they said, adding that they were conducting "extensive investigations".
The stabbing was also not far from parliament in The Hague, which is the seat of government for the Netherlands and home to many worldwide organisations.
The police did not motivate the stabbing and said she was still looking for the suspect.
Police have named the London Bridge attacker as convicted terrorist Usman Khan.
In March, 4 people were killed when a Turkish-born man opened fire on a tram in the city of Utrecht.
He was jailed for 26 years in October this year.