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Amcu protesters pelted cars with stones and barricaded roads in Rustenburg on Friday morning as a strike in the platinum industry turned ugly in only its second day.
Police spokesperson - Brigadier Thulani Ngubane - said the violence was happening despite the request by police and AMCU leadership that the strike be conducted in a peaceful manner.
Several incidents have been reported since the strike for better wages started on Thursday.
Ngubane says a group of about 50 people barricaded a road between Jabulani Hostel and Khuseleka Shaft with burning tyres, stones and rubble.
He said in another incident in the early hours of Friday, a Chinese furniture shop was burnt to the ground at Wonderkop in Marikana.
An Amcu co-ordinator claims that mine security used water cannons on strikers at Anglo American Platinum's Khuseleka mine a short while ago and that the situation is tense.