Eight people had to be evacuated from their homes in St Ouen overnight following an explosion and fire in an oil heating system.
Fire crews were called out just before 1.30am.
Two engines were initially dispatched.
They found the fire had spread within the roof of the nine properties. A third appliance was sent to the scene.
14 firefighters attended and used breathing apparatus and high pressure hose reels to put out the blaze, understood to be in sheltered housing.
The residents were evacuated because of the large amount of smoke. Two people were taken to hospital for smoke inhalation.

Government gives £150k to get Jersey athletes to 2027 Island Games
Mansell Collection scales back after fall in motorbike sales
Jersey Zoo announces death of Biggy the tortoise
Jersey voted top 5 British island
Jersey food allergen law stalls despite warnings over risk to lives
Police appeal after cyclist injured in St Peter’s Valley collision
Victoria College to double bursary places
2027 DFDS schedule details confirmed