Rotterdam police said the suspect had been arrested and a firearm had been seized.
Two people have been killed and two others seriously wounded in a shooting at a Dutch care home, police said.
Officers were alerted to an incident on Friday morning at a countryside home and farm in Molensingel, on the outskirts of Alblasserdam.
Rotterdam police said on Twitter that “the suspect has been arrested and the firearm has been seized”.
"The witnesses are taken care of, help is arranged for them [and] the investigation is underway," they added.
According to Dutch media, the care home houses young people and adults who are trying to get their lives back on track, while people with disabilities also work at the farm.
The police later confirmed on Twitter that a 34-year-old woman from Alblasserdam and a 16-year-old girl from Dordrecht were killed in the shooting.
A 20-year-old woman and a 12-year-old boy were injured while a third person was treated for shock, they added on Twitter.
The 38-year-old suspect is also believed to have been involved in the separate death of a 60-year-old man at a shop in the region on Wednesday evening.
"The man was on the run," police said in a statement. "Shortly after the drama in Alblasserdam on Friday morning, it turned out that the arrested man was the same man the Zeeland police were looking for."
A large-scale investigation into the two incidents is underway.