Explosion occurred when workers were cleaning an empty tank.
An explosion at a chemical plant in the Czech Republic killed six workers and injured two others. The explosion happened at Unipetrol, a Czech oil processor and plastics producer. According to ABC News, the blast took place inside one of the storage tank for fuels and additives in its refinery in the town of Kralupy nad Vltavou, 10 miles north of Prague.
A Kralupy town crisis manager said the explosion seemed to occur when workers were cleaning an empty tank.
