The 20-year-old singer reportedly accompanied his friends in an ambulance after a patio heater exploded on his balcony in Canary Wharf, East London.
A resident at the luxury block of flats, named Ali, told The Mirror he called 999. Describing the scene he said: “We were evacuated downstairs in the lift. Then a guy ran out with a cloth on his hands screaming. I didn’t get a look at him.
“There was a guy who had burnt his face who was being helped by the emergency services. I didn’t see his face but he was quite a tall guy."
A male pal of Liam's suffered 20 percent burns and another man and woman suffered superficial burns to their hands. They had escaped the flat before firefighters arrived.
A source told the paper: “His friend went to fill up the gas for a heating lamp, there was some sort of accident and the whole balcony went up in flames.”
London Fire Brigade tweeted: "We've just put out a fire in a flat on the 34th floor of a building in Canary Wharf. Two men are being treated by @Ldn_Ambulance for burns."
In an incident report on their website, they wrote the Brigade was called at 21.48 and the fire was under control at 22.34.
Station Manager Laurie Kenny, who was at the scene, said: "Firefighters worked quickly and professionally to get the fire under control as quickly as possible. Around 30 people left the building before we arrived and were not injured. Two of the occupants had superficial burns to their hands and the third had burns to his hands and face. All three have been taken to hospital."
The cause of the fire, which took six engines and 35 firefighters to control, is under now investigation.
The Mirror also reports that Liam's new girlfriend Sophia Smith may have been with him at the time of the incident.