Several people had to be evacuated from a Hauteville building after smoke filled one of the apartments.
All three emergency services were called to Hauteville just after 05:00 on Sunday morning.
A spokesman for St John said two double-crewed emergency ambulances, a paramedic incident officer and a senior officer had to be dispatched to the scene for an hour and a half.
"Due to the nature of the incident there were a number of potential casualties who had been in the building at the time of the fire, who had either escaped or been evacuated from property with the help of the emergency services," they said.
"Initial assessments of the patients were carried out quickly and smoothly by St John clinicians. Two patients were assessed at the scene for the possible effects of smoke inhalation, but did not require transfer to the Emergency Department at that time. A number of other people who had been involved in the incident declined treatment."
Because of the number of St John staff who were at the house fire, off-duty staff had to be called back to work to help maintain operational cover for the rest of the island.
Pictured top: Hauteville.
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