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An army bomb disposal expert inspects an unexploded World War II 50-kilogram (110-pound) bomb, believed to have been dropped over London during German bombing raids in the early 1940s, which was discovered by workers at a construction site near Wembley Stadium, May 21, 2015 (Credit: Mod Crown/Royal Logistics Corps/Sargeant Rupert Frere)

An army bomb disposal expert inspects an unexploded World War II 50-kilogram (110-pound) bomb, believed to have been dropped over London during German bombing raids in the early 1940s, which was discovered by workers at a construction site near Wembley Stadium, May 21, 2015 (Credit: Mod Crown/Royal Logistics Corps/Sargeant Rupert Frere)