Two estate workers and two paramedics were taken to hospital on Wednesday following a suspected cyanide poisoning incident on the Isle of Lewis.
A vehicle travelling to Stornoway was stopped by police near Achmore, amid fears that two private estate workers had been contaminated.
Police said the noxious substance had being used for pest control at a private estate in Timsgarry, Isle of Lewis.
A roadside decontamination unit was set up and several routes were closed.
A police spokesman said: “Two male estate workers and two female ambulance personnel were taken to the Western Isles hospital following precautionary decontamination as a result of an incident.
“Both ambulance personnel and one of the estate workers were discharged following assessment. One man is due to be discharged following further assessment.”
The A858, which had been close one mile from Cameron Terrace, has re-opened and the Highlands and Islands Fire and Rescue Service is carrying out an assessment of the property where the incident occurred.
The spokesman added that “enquiries are continuing into the incident” and that “there is not believed to be any further risk to the public”.
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