A fire broke out in a unit on the 10th floor of Block 4, Sago Lane early Monday (Jan 23) morning.
Stomp contributor Yin Khay said that its balcony had caught fire.
She said: "Firefighters knocked on some units' doors to evacuate people. "I also heard some people shouting, "Fire! Fire!."
According to Yin Khay, the fire was put out in 30 minutes.
The Singapore Civil Defence Force (SCDF) confirmed it received a call at around 5am regarding a fire at Sago Lane.
SCDF deployed two fire engines, two red Rhinos, an ambulance and a support vehicle to the scene.
Upon arrival, firefighters extinguished the fire in the flat's kitchen using a compressed air foam jet and a water jet.
They also rescued two occupants of the unit - a Chinese woman in her 80s and a Chinese man in his 50s.
Both suffered from smoke inhalation and were taken to Singapore General Hospital.
15 residents from the block's upper floors self-evacuated.
The cause of the fire is under investigation.