More than 30 people were killed in clashes between police and striking miners at a South African mine on Thursday, the police minister has said.
Police opened fire after failing to disperse strikers armed with clubs and machetes at the Marikana mine.
The Lonmin-owned platinum mine has been at the centre of a violent pay dispute, exacerbated by tensions between two rival trade unions. The incident was one of the bloodiest police operations since apartheid. Violence had already killed 10 people, including two police officers, since the strike began a week ago.
On Friday, Police Minister Nathi Mthethwa confirmed the toll to a local radio station, adding: "A lot of people were injured and the number keeps on going up."
The powerful National Union of Mineworkers put the figure at 36, according to AFP news agency.
Police were sent to break up some 3,000 miners who had gathered on a hillside overlooking Marikana, which lies about 100 km (62 miles) north-west of Johannesburg, to call for a pay rise of more than $1,000 (£636) a month.
The circumstances that led police to open fire remain unclear, but reports from eyewitnesses suggest the shooting took place after a group of demonstrators rushed at a line of police officers. Police, armed with automatic rifles and pistols, fired dozens of shots, witnesses said.
One witness said police had first used water cannon, tear gas and stun grenades in an attempt to break up the protest.
Police ministry spokesman Zweli Mnisi defended the actions of police, saying they had a right to defend themselves.
"We had a situation where people who were armed to the teeth, attack and killed others - even police officers," the spokesman said in a statement on Thursday night, "What should police do in such situations when clearly what they are faced with are armed and hardcore criminals who murder police?"
He said an investigation into the incident had begun.
In a statement, President Jacob Zuma said he was "shocked and dismayed at this senseless violence".
Thursday's incident came after several days of violent strikes in which 10 people were killed, including two police officers who were hacked to death.
The stand-off has been exacerbated by rivalry between two trade unions, with the Association of Mineworkers and Construction Union (AMCU), a new group, seeking to challenge the dominance of the National Union of Mineworkers (NUM).