Turkish prosecutors have charged three people with reckless manslaughter over a mining disaster that left 301 dead and sparked fury at the government and company officials.
Rescue operations ended on Saturday in the western town of Soma after the bodies of the last two trapped miners were retrieved following the country's worst ever industrial disaster.
Prosecutors said they have ruled out an electrical fault, which was initially believed to be the cause of the devastating coalmine blast.
A preliminary report into the disaster "suggested the fire could have been caused by coal heating up after coming into contact with air", prosecutor Bekir Sahiner told journalists on Sunday.
This could have caused a massive amount of carbon monoxide to fill the mine.
"Twenty-five people have been ... detained, including the chairman of the company and three of them have been charged with reckless manslaughter," Sahiner said.
Six people have since been released and the others were still being questioned.
The Dogan news agency reported that those charged were plant manager Akin Celik and two mining engineers from mine operator Soma Komur.
Soma Komur has vehemently denied any negligence.
"We have all worked very hard. I have not seen such an incident in 20 years," Celik said on Friday.
The labour ministry also denied culpability, saying the mine had been inspected every six months.
The Milliyet newspaper claimed to have seen the preliminary report, which it said noted several safety violations in the mine, including a shortage of carbon monoxide detectors and ceilings made of wood instead of metal.
A group of rescue workers told NTV that a cave-in had occurred in the mine after the ceilings burnt down and collapsed as a result of the fire.
The Soma disaster has sparked a wave of fury against the government, adding to pressure on Prime Minister Recep Tayyip Erdogan ahead of his expected bid for the presidency in August.
Soma was in a virtual lockdown on Sunday after checkpoints were set up on the main roads leading to the town where all demonstrations were banned, AFP reporters on the scene said.
Only inspectors and security forces were allowed at the site of the disaster after the rescue teams had left.
A total of 787 people were inside the mine when the blast hit, Energy Minister Taner Yildiz said. Most of the victims died of carbon monoxide poisoning.
"I was very sad when I came here and I am still very sad," Yildiz told reporters before leaving Soma on Sunday, pledging support for the stricken families.
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