The blaze is understood to have been started shortly after 1am on Wednesday 27 August.
Multiple crews from Mid and West Wales Fire and Rescue Service were sent to the property, described as two-storey mid-terrace flat.
South Wales Police confirmed the fire is believed to have been started deliberately on the property’s shared balcony.
A local man was later taken to hospital, where his condition is believed to be life-threatening.
In a statement South Wales Police said:
“Officers were called to Gors Avenue, Townhill, Swansea just after 1am today (Wednesday August 27) following a report of a house fire.
“The fire is believed to have been started deliberately on the shared balcony of the property which sustained extensive fire damage.
“A man from Townhill has been taken to hospital with serious burn injuries. His condition is believed to be life-threatening. A scene remains in place at the property whilst an investigation is carried out.”
A spokeswoman for Mid and West Wales Fire and Rescue Service said:
“At 1.05am on Wednesday, August 27, Mid and West Wales Fire and Rescue Service crews from Gorseinon, Morriston, and Swansea Central Fire Station were called to an incident at Townhill, Swansea.
“Crews responded to a fire on a balcony of a two-storey mid-terrace flat. Crews utilised one hose reel jet, one thermal imagining camera, and forced entry tools to extinguish the fire.
“One casualty sustained burns and was conveyed to hospital.
“Crews left the scene at 2.46am.”
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