Greek Minsters: 26 people burned because of one wall
Greek Defence Minister Panos Kammenos has told the illegal construction contributed to one of the country's worst-ever wildfire disasters.
He said building by residents between wooded areas was a "crime" that had resulted in blocking escape routes.
Mr Kammenos was confronted by angry locals as he visited areas devastated by fires east of Athens this week.
One man said he had reached the fire station to ask for help, and found firefighters unaware of the blaze.
Another resident complained that people had been advised to dive into the sea to escape, when most of the elderly were unable to reach the sea in the first place.
Many of the survivors were saved by the sea, but dozens of victims were unable to reach the water.
"This is a crime from the past," Kammenos said. "This coast of Athens, all these properties, the majority are without a licence, and they have occupied the coast without rules."
At least 83 people died and search teams fear they will find further victims as dozens more are missing.
Dozens of rescue workers searching a cliffside in the seaside town of Mati on Thursday found more human remains.
Many of the victims were caught close to the cliff as the flames spread rapidly, whipped up by winds as high as 120km/h (75mph). Relatives have been providing their DNA to help identify the bodies of the victims.
Some 60 people are still being treated in hospital, 11 of them in intensive care.