A “performance artist” sparked a major security alert in London on Wednesday when she left five packages, one with nails sticking out of it, across a busy area of the city during the morning rush-hour, police said. The woman, who has not been named, told officers she had strategically planted the “devices” around the Shepherds Bush and Hammersmith Grove areas of west London, a major traffic and transport hub crammed with commuters on their way to work. Full Story