Five people were injured, including two Americans, in a "serious" stabbing attack that occurred in broad daylight in Amsterdam's city center on Thursday, police said. The suspected assailant is in custody and a motive remains under investigation into what authorities are considering might have been a random attack, police said.

Police in the Netherlands say a knife-wielding assailant has seriously wounded five people in a stabbing attack in Amsterdam before he was taken into custody.

Police now say four people were stabbed in central Amsterdam on Thursday afternoon, after the suspect was included in the original total of five. More details are now emerging about what happened in the heart of the old city although police have not yet commented on the attacker’s identity or motive.