At least 16 people, including three children, have died in a toxic gas leak in South Africa, police have said.
Emergency services said on Wednesday that as many as 24 people were dead.
It wasn't immediately clear why there was a discrepancy in the death toll.
Search and rescue teams were still working through the area trying to ascertain the extent of the casualties.
The incident happened in an informal settlement in the city of Boksburg on the eastern outskirts of Johannesburg, the South African Police Services said.
Police said the three children killed were aged 1, 6 and 15. Two people were taken to the hospital for treatment, officers added.
Emergency services spokesman William Ntladi said that Wednesday's deaths were caused by a leak from a gas cylinder being kept in a shack in the Angelo informal settlement.
He said the leak had stopped and teams were searching a 100-meter radius around the cylinder to check for more casualties.
The bodies were still lying on the ground "in and around the area," Ntladi said, and forensic investigators and pathologists were on their way to the scene.
"We can't move anybody," Ntladi said. "The bodies are still where they are on the ground."
Ntladi said the initial information authorities had indicated the cylinder was being used by illegal miners to process gold inside a shack.
Illegal mining is rife in the gold-rich areas around Johannesburg, where miners go into closed off and disused mines to search for any deposits left over.
Boksburg is the same city where 41 people died after a truck carrying gas got stuck under a bridge and exploded on Christmas Eve.
