Earlier Saturday, the USA ambassador to the Netherlands confirmed that the two people injured Friday were Americans visiting the Netherlands when they were stabbed at the station.
The suspect, identified only as Jawed S., is expected to make his first appearance in court on Monday as police probe whether a "terrorist motive" was behind the apparently unprovoked attack Friday, officials said.
"From the suspect's statements so far, it is clear the man had a terrorist motive. and that he traveled to the Netherlands for that reason", the prosecutors' said.
A police spokesman told CNN the teenage suspect remains in a hospital, where he will be questioned later Saturday with the help of a translator.
The attacker, a 19-year-old Afghan man, was shot by police as he walked away but survived.
Police quickly arrived at the scene with video images showing police ordering the suspect in English to "stay down" after he had been shot.
Two American citizens - both believed to be male - were seriously injured when a knife-wielding man attacked bystanders around noon on Friday at the busy station next to the Dutch capital's historic city centre.
Sprong says the Americans also remain hospitalized with "serious but non-life threatening injuries".
State Department spokeswoman Heather Nauert said the USA was "ready to assist Dutch authorities in their investigations as appropriate".
Authorities in the Netherlands say terrorism appears to be the motive behind at Amsterdam Centraal train station on Friday afternoon.
A passerby's dramatic photo showed two officers pointing guns at a man in jeans and sneakers sprawled on the ground inside a train station.
"We are aware that both victims were United States citizens and have been in touch with them and their families", Pete Hoekstra said in a statement.
The stabbing occurred in Amsterdam's Central Station which is the city's busiest train station.
Officials have said that the suspect is in possession of a temporary German residence permit and was in the process of obtaining a permanent one.
The Netherlands has been largely spared the kind of terror attacks which have rocked its closest European neighbours in the past few years. The man is scheduled to be arraigned tomorrow; however, Dutch authorities did not disclose the charges he could face.
An estimated 250,000 people use the Central Station each day.