Thousands of mine workers have downed tools at South Africa's Lonmin mine after a union leader was shot dead in the restive platinum belt at the weekend, a company official said.



"Lonmin operations are suspended this morning due to an illegal work stoppage," Sue Vey, a spokeswoman for Lonmin told, told the AFP news agency on Tuesday, adding that work had stopped at all of the firm's 13 shafts in the northwestern Rustenburg mining town.

Al Jazeera's Tania Page, reporting from Johannesburg, tweeted that Lonmin management were unsure about the motives behind the strike, but that protests were peaceful.



The workers were singing and dancing on the streets, according to a witness.



The strikes come amid growing union rivalry in the region where 34 miners were last year gunned down by police during a wildcat strike at Lonmin's Marikana mines.



Last Saturday, four unidentified men killed a mining union leader Mawethu Steven as he was watching football in a bar in Rustenburg.



Steven was a member of the Association of Mineworkers and Construction Union (AMCU) which has recorded growing membership at the mine.



Police brutality



The union leader was due to testify at a judicial inquiry into last year's killings by police of striking mineworkers, an incident which shocked the world and brought back memories of apartheid police brutality.



Meanwhile, the National Union of Mineworkers (NUM), a rival union, alleged the striking workers were intimidating its representatives.

"There is intimidation and violence. They are singing and dancing and have blocked roads," the group said.



"Cars are being turned away. It's really bad," Mxhasi Sithethi, a regional coordinator for the NUM, said from Rustenburg.



Gideon du Plessis, deputy general secretary of the Solidarity trade union which represents skilled workers, said he

understood AMCU was demanding the NUM close its office at Lonmin.



Police said they were monitoring the situation but there were no plans at this stage to increase their presence. That

would change should the protest escalate and spread beyond Lonmin's immediate properties, they said.



"We are just doing our normal patrols," said Thulani Ngubane, police spokesman for the Northwest province, where

Lonmin's operations are based. "At this point there is no march, there is nothing on the streets of Marikana."



AMCU was recently recognised as the majority union at Lonmin and at neighbouring Anglo American Platinum, dislodging the powerful NUM from the top position.



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