Miners at Chilean state-owned Codelco, the world's largest copper producer, strike to protest over the closure of a smelter located some 140 km west of Santiago, an area known as the "Chilean Chernobyl", as it is one of the country's most polluted regions. Codelco's decision comes after an incident on June 9 when 115 people, mostly school children, suffered sulphur dioxide poisoning released by heavy industry, provoking the closure of schools in the area. IMAGES AND SOUNDBITES