An explosion at a coal mine in eastern Iran kills at least 34 workers

abcnews.go.com:

An explosion in a coal mine in eastern Iran has killed at least 34 workers and injured 17 others

TEHRAN, Iran — An explosion in a coal mine in eastern Iran killed at least 34 workers and injured 17 others, officials said Sunday, marking one of the worst mining disasters in the country's history as others remained missing hours after the blast.

The blast struck a coal mine in Tabas, about 540 kilometers (335 miles) southeast of the capital, Tehran, on Saturday night. By Sunday, weeping miners stood alongside mine cars that brought up the bodies of their colleagues, all covered in coal dust.

Around 70 people had been working at the time of the blast. State television later said that 17 were believed to be trapped at a depth of 200 meters (650 feet) down a 700-meter (2,300-foot) tunnel. However, figures kept changing throughout Sunday regarding the disaster in the rural area with some reports suggesting the death toll was higher.

A provincial emergency official, Mohammad Ali Akhoundi, told the state-run IRNA news agency Sunday afternoon that the death toll had reached at least 34 as rescue efforts continued.

Survivors interviewed by state TV, still smudged in coal dust, described chaotic scenes after the blast.

“We were in the mine, working. Suddenly there was some smoke rising… then I noticed I had difficulty breathing," said one miner, whom state TV did not identify. «I jumped off from the workshop and I scrambled until I reached somewhere (safe). My friends (remained) in there.”

Authorities blamed the blast on a leak of methane gas. Such gases are common in mining, though modern safety measures call for ventilation and other measures to protect workers.

It wasn't immediately clear what safety procedures were in