"We are seriously taking into account that there was a terrorist motive", Amsterdam police spokesman Frans Zuiderhoek told AFP.
Police said in the hours after Friday's attack they were considering any and all motives.
In the most serious incident involving a terror attack, outspoken Dutch anti-Islam film director Theo van Gogh was shot and stabbed to death in 2004 in Amsterdam by a man with ties to a Dutch Islamist terror network.
Dutch police were also in close contact with their German counterparts in regards to the suspect's background, he added. After all, you are at Amsterdam Central Station. The fact that Jawad S. had a German residency permit likely means he is one of the million-plus people who entered Germany under Angela Merkel's open borders policy.
German police searched his home at the request of their Dutch colleagues and found sized several data carriers, authorities said.
He was scheduled to be arraigned during a closed-door hearing with an investigating judge on Monday.
"The initial investigation by police does not indicate that the victims were deliberately chosen".
But amid a number of scares and reports that people linked to some of those attacks may have crossed briefly into the country, top Dutch security and intelligence officials have stressed that the threat level is substantial.
A statement issued Saturday by Amsterdam's city council said the Americans did not appear to have been victims of a targeted attack.
The local government said today it had no immediate plans to beef up security in the city, saying the swift action by police "shows that Amsterdam is prepared for this kind of incident".
Panic broke out at the Dutch capital's main station shortly after midday Friday when the suspect stabbed two bystanders before he was shot and wounded by officers.
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.
Ambassador Pete Hoekstra issued a written statement saying US Embassy officials had been in touch with the victims or their families. Trams to and from the square in front of the station were stopped as police and emergency services converged on the area.
On Friday, witnesses described utter chaos as gunshots rang out in Amsterdam's busiest train station, as thousands of commuters and tourists were evacuated just after noon. Friday is one of the busiest days of the week for train travel as tourists arrive for the weekend.