Police are appealing for information after hazardous capsules were taken in a burglary from a farm in Holmfirth.
The incident occurred around 12.30am in the early hours of this morning (10/05), when offenders forced entry into an outbuilding on Cliff Road.
Capsules of phosphine were taken from a secure metal safe in the burglary. The capsules are highly toxic, particularly if they come into contact with water, and are typically used in vermin control.
A quad bike was also stolen in the incident.
PC Jayne Robertson, of Kirklees Police, said: "Our enquiries are ongoing and we are appealing for anyone who has any information on this theft or those involved, to please get in contact with police.
"The capsules have gone missing in a silver container, with a red sticker on the front, labelled Talunex.
"We would urge anyone who knows where these capsules are or finds the container of capsules, not to handle them or dispose of them, but to contact police.
If anyone believes they may have come into contact with phosphine they should seek medical advice as symptoms of exposure are not always immediately apparent.