More details have emerged about the Friday morning shooting on a farm in Alblasserdam south east of Rotterdam, where adults and children with psychiatric disabilities go for occupational therapy.

Police now say a 34-year-old woman and a 16-year-old girl were killed, and a 20-year-old woman and 13-year-old boy were seriously injured. A fifth person was slightly hurt in the shooting.

The suspect has been arrested and help is being organised for the eyewitnesses, police said on Twitter.

The man who has been arrested has been named by the AD as 38-year-old John S from the nearby village of Oud-Alblas. The paper, citing confidential sources, says the man has a history of psychiatric problems and was known to the police.

The location of the shooting is a farm on the Molensingel on the edge of the town, which was used as a treatment centre for children and adults with psychiatric problems. In addition, it offers help to youngsters and adults to ‘get their lives back on track again’.

The zorgboederij, or care farm, is a concept which allows people with problems or disabilities to work with animals or on the land, as occupational therapy.

The farm looks out onto the Kinderdijk wind mill park, which is popular with tourists.