SOUTH KOREAN lorry drivers blocked deliveries of raw materials for semiconductors and petrochemical products today during their fourth day of strike action. 

Production was reportedly halved at Hyundai Motors, while haulage workers also disrupted shipments for a range of companies including steelmaking giant Posco. 

Some 1,000 drivers blockaded the Hyundai plant and asked non-union members not to cross their picket line. Police made at least 30 arrests under South Korea’s restrictive anti-trade union laws.