A decontamination area has been set up at a hospital following what a fire service has described as a "chemical leak".
Hertfordshire Fire and Rescue Service said it had been called to Hemel Hempstead Hospital, in Hillfield Road, alongside other emergency services.
In a post in social media at 11:37 BST on Monday, it said: "We are currently in attendance at Hemel Hempstead Hospital following a chemical leak.
"People have been evacuated from the immediate scene and a decontamination area has been established while investigations continue."
West Hertfordshire Hospitals NHS Trust has been approached for comment.
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