An unexploded aerial bomb from World War II was safely detonated in a controlled explosion at a large petrochemical production site in the Czech Republic on Friday, police said. The explosion of the British bomb weighing more than 200 kilograms, which was carried out by remote detonation, sent a huge cloud of dust into the air, images on television showed. The bomb was found over a week ago on the site of the Unipetrol refinery in Litvínov, a town in the north-west of the country near the German border. Technicians from the explosive ordnance disposal service erected a 5-metre high protective …