A fireman suffered "major traumatic injuries" while he was on duty.
The man, who has not been named by Merseyside Fire and Rescue, was "on duty" on January 9 when North West Ambulance Service was called to Thornton Street, Litherland following a 999 call. The fireman in his 50s was taken to hospital.
HSE confirmed that they are "looking into" the incident. Merseyside Fire and Rescue have said they take the health and safety of their employees "very seriously".
