Staff working at Aintree University Hospital said that it smelled like "burning rubber" when a fire broke out in the early hours of the morning.
Emergency services were alerted to the fire at 4.34am on Wednesday (August 10) and were on scene by 4.40am. Merseyside Police, Merseyside Fire & Rescue Service and Lancashire Fire & Rescue Service attended.
They found that there was a fire in a plant building on the roof of a three-storey building next to Accident & Emergency. Patients were evacuated from nearby areas while firefighters worked to tackle the blaze.