The U.S. ambassador to the Netherlands said that two people stabbed in an attack at the Dutch capital’s main railway station Friday are both American citizens.

Police shot and wounded a 19-year-old Afghani man immediately after the attack and are questioning him as a suspect.

Ambassador Pete Hoekstra issued a written statement Saturday saying embassy officials had been in touch with the victims or their families. Police say they have serious but not life threatening injuries.

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Mr. Hoekstra said, “We wish them a speedy recovery and are working closely with the City of Amsterdam to provide assistance to them and their families.”

Police say they are still trying to establish a motive for the attack and say it was possibly motivated by extremism.