ISTANBUL - Turkish President Recep Tayyip Erdogan conceded "shortcomings" after criticism of his government's response to the massive earthquake that has killed over 15,000 people in Türkiye and Syria.
The sprawling scale of the disaster that flattened thousands of buildings, trapping an unknown number of people, has swamped relief operations already hampered by freezing weather.
Survivors have been left to scramble for food and shelter -- and in some cases watch helplessly as their relatives called for rescue, and eventually went silent under the debris.
READ: More survivors found as Türkiye-Syria quake toll tops 11,200
Still, searchers kept pulling survivors from the debris three days after the 7.8 magnitude quake that is already one of the deadliest this century, even as the death toll continues to rise.
As criticism mounted online, Erdogan visited one of the hardest-hit spots, quake epicentre Kahramanmaras, and acknowledged problems in the response.
"Of course, there are shortcomings. The conditions are clear to see. It's not possible to be ready for a disaster like this," he said.
The window for rescuers to find survivors is narrowing as the effort nears the 72-hour mark that disaster experts consider the most likely period to save lives.
Yet on Wednesday, rescuers pulled children from under a collapsed building in the hard-hit Turkish province of Hatay, where whole stretches of towns have been levelled.
"All of a sudden we heard voices and thanks to the excavator... immediately we heard the voices of three people at the same time," said rescuer Alperen Cetinkaya.
READ: Syria's White Helmets rescuers urge international quake help
"We are expecting more of them... the chances of getting people out of here alive are very high," he added.
Officials and medics said 12,391 people had died in Turkey and at least 2,992 in Syria from Monday's 7.8-magnitude tremor, bringing the total to 15,383 -- and experts fear the number will continue to rise sharply.
In Brussels, the EU is planning a donors conference in March to mobilise international aid for Syria and Turkey.
READ: Children pulled from rubble as Türkiye-Syria quake toll tops 7,800
"We are now racing against the clock to save lives together," said EU chief Ursula von der Leyen on Twitter.
"No one should be left alone when a tragedy like this hits a people," von der Leyen said
The White Helmets, leading efforts to rescue people buried under rubble in rebel-held areas of Syria, have appealed for international help in their "race against time".
They have been toiling since the quake to pull survivors out from under the debris of dozens of flattened buildings in northwestern areas of war-torn Syria that remain outside the government's control.
A leading UN official called for the facilitation of aid access to rebel-held areas in the northwest, warning relief stocks will soon be depleted.
"Put politics aside and let us do our humanitarian work," the UN's resident Syria coordinator El-Mostafa Benlamlih told AFP in an interview.
The issue of aid to Syria is a delicate one, and the sanctioned government in Damascus made an official plea to the EU for help, the bloc's commissioner for crisis management Janez Lenarcic said.