Dutch police searched on Saturday for an unidentified suspect who stabbed three youths on a street in the centre of The Hague on Friday during one of the busiest shopping evenings of the year.
Investigators were keeping "all scenarios open" on the perpetrator's identity and motive, police spokeswoman Marije Kuiper said.
The people injured were discharged from hospital late on Friday.
Police have not released any information about the suspect's appearance, but said an initial description of him as a man in his 40's was wrong.
National broadcaster NOS quoted two eyewitnesses as saying two of the victims, both girls, had run screaming from the street into a nearby store. One said an "athletic" man fled the scene, jumping easily over obstacles.
The area was cordoned off for hours as first aid workers helped victims and police combed the area for clues.