South African police officers killed more than 30 striking workers at a Lonmin PLC platinum mine who charged a line of officers trying to disperse them, authorities said Friday, August 17, AP reported.

The shooting Thursday is one of the worst in South Africa since the end of the apartheid era.

Police ministry spokesman Zweli Mnisi said on Friday that more than 30 people were killed. He said an investigation into the shooting near Marikana, about 70 kilometers (40 miles) northwest of Johannesburg was underway.

The shooting happened Thursday afternoon after police failed to get the striking miners to hand over machetes, clubs and other weapons.

Some miners did leave, though others carrying weapons began war chants and soon started marching toward the township near the mine, said Molaole Montsho, a journalist with the South African Press Association who was at the scene.

The police opened up with a water cannon first, then used stun grenades and tear gas to try and break up the crowd, Montsho said.