Gardai are treating a fire on North Circular Road this morning as arson.
Quick-thinking passers-by saved the lives of several people when they ran into the blazing house and raised the alarm this morning.
The fire broke out at around 7am in the terraced property near the Oxmantown Road.
Residents of the flats who were evacuated said the fire started upstairs, and sources have told Independent.ie that the fire is being treated as suspicious.
There were no injuries in the fire, but sources at the scene said the quick actions of neighbours and passers-by averted a tragedy.
Eight residents were evacuated from the house and took shelter in neighbouring properties as three units of Dublin Fire Brigade fought the blaze.
One resident told Independent.ie that his life was saved by people who saw the fire from the street.
"I was asleep in my bed and I knew nothing about the fire. And then I head shouting from the street 'fire, fire, everyone has to get out' and if they hadn't seen it I could have died," said Romanian native Cristian Danci.
There were long traffic delays on the North Circular Road, which was closed from Oxmantown Road to O'Devaney Gardens.
Gardai said they are treating the fire as suspicious.
"Early indications are that an accelerant was used to start the fire but we have to wait for a full technical examination to take place before that can be confirmed," they said.