An unexploded World War II bomb was discovered in dense silt Sunday in the River Thames by the runway of London's City Airport. The airport shut for the day while Royal Navy divers removed the bomb, affecting 16,000 travelers. The bomb was dragged 60km to sea on Tuesday, and destroyed on Wednesday. The 500-kilogram, 1.5-metre-long tapered-end shell was blown up with high-grade military detonators off the coast of Essex.