Four children were taken to hospital as a precaution after unidentified tablets were found at a school.
Police were called at around 1pm today to an incident at Holywell Green Primary School in which some children had come into contact with “tablets”.
West Yorkshire Police said a woman in her 20s has been arrested in connection with the incident.
The Force did not say what kind of tablets had been recovered.
One parent claimed a child had brought a bag of drugs into the school.
Calderdale Council’s Director for Adults and Children’s Services Stuart Smith said: “We are aware that some children from a school in Calderdale have attended hospital today and their parents have been informed.
"Police and social workers are investigating the circumstances.”
