Meanwhile, the bodies of 26 adults and children who apparently died hugging each other were found close to the sea.
Some 187 people have been hospitalized, with 82 being treated late Tuesday, including nearly a dozen children, most of whom were in "serious condition", fire officials said.
Gale-force winds fanning the flames in the area also hampered firefighting efforts and whipped up the seas. When the fires first started, many chose to stay and try to save their properties but then they quickly understood that they had to leave urgently.
Athanasia Oktapodi, whose home is surrounded by pine trees, said she first spotted the fire moving down the hill "and five or ten minutes later it was in my garden".
Dimitri Piros, director of medical services for Ekav, Greece's nationwide ambulance service, told the BBC that people had suffered horrific injuries because of the speed of the fire.
In 2007, more than 60 people were killed when huge fires swept across the southern Peloponnese region.
Greek Prime Minister Alexis Tsipras declared three days of mourning, saying the country is experiencing an "unspeakable tragedy", per The Telegraph.
What is happening here in eastern Attica is a black hell.
Interior Minister Panos Skourletis said rescue workers were "still searching if there are more missing". I've never seen anything like this before in my life.
A lot of them were tourists who had tried to find refuge but did not make it. "You can't. That's the only tragic thing", he said. After that, police blocked access to everyone except rescuers.
Twenty-six of the dead were found after dawn on Tuesday, huddled in a compound near the sea in the community of Mati, the worst-hit area near Rafina, about 50 kilometres west of Athens.
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"We just saw the road going into smoke, and then all of a sudden the flames were on the left-hand side of the vehicle". Others died in buildings or cars. "Instinctively, seeing the end nearing, they embraced", Economopoulos said.
The blaze struck like a flamethrower, he said, causing smoke inhalation and skin burns. Coast guard and private boats picked them up to be transported to safer coastal towns.
Survivor Kostas Laganos said: "It burned our backs and we dived into the water".
'I was at the pool and you could smell the fire, but we were told it was a regular occurrence, ' said Fred.
Speaking to RTÉ Radio after visiting Mati, he said: "The area can only be compared to Syria on a day of heavy bombardment".
Charred bodies lay just 15m (50ft) from the sea, photographer Pantelis Saitas told the Athens-Macedonian News Agency. Stoked by high winds, the flames quickly engulfed entire villages, particularly the village of Mati, in the area around Athens on Monday, giving people little time to escape the inferno.
How are the authorities responding?
Dramatic video footage showed people fleeing by vehicle as the tourist-friendly Attica region declared a state of emergency. Israel, Turkey, Macedonia, Bulgaria, Croatia, Italy and Germany also offered assistance.
Greece issued an urgent appeal for help to tackle fires that raged out of control in several places across the country, destroying homes and disrupting major transport links.
Some public officials have suggested that at least some hot spots might have been sparked by looters hoping to ransack houses.