Julius Malema barred from addressing South Africa miners
17 September 2012 Last updated at 17:29 BST
Firebrand politician Julius Malema has been barred by police from addressing striking workers at South Africa's Marikana mine.
Some 2,000 miners had gathered at a stadium near the mine, about 60 miles (100km) north-west of Johannesburg.
Strikes have already halted production at several gold and platinum mines in the resource-rich country.
South African President Jacob Zuma said that the disruption had cost the industry $548m (£337m) in lost output.