Four children were taken to hospital as a precaution after unidentified tablets were found at a school.
West Yorkshire Police said a woman in her 20s has been arrested in connection with an incident which had occurred on Friday at Holywel Green Primary School, in which some children had come into contact with tablets.
The Force did not say what kind of tablets had been recovered
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.

Four Men Charged Following Series of Warrants in Rochdale
Oxford Man Jailed for 17 Years for Serious Offences Against Woman
First Phase of £19.1m Brighouse Town Centre Transformation Completed
New £2,500-a-Day Roadworks Charges Introduced Across West Yorkshire
Two Men Injured in Charing Cross Road Stabbing
Work Begins on New Cheadle Train Station After More Than a Century
Hundreds of Pills Seized Following Halifax Town Centre Arrest
Teaching Assistant Jailed for Offences Against Child in Bradford
Plans Revealed for New 18.5km West London Overground Route
£505,000 Investment Proposed to Step Up Fight Against Fly-Tipping in Blackburn with Darwen
More Than 1,500 Fireworks Incidents Recorded Across West Yorkshire but Just 10 Arrests
Legal Show
The Golden Era
Remix Saturdays
Alim OnAir