Security for Taylor Swift’s London shows this coming week is ramped up after Austrian security officials say a 19-year-old was planning to kill "a large crowd of people" in a suicide attack at a Taylor Swift concert in Vienna. Officials say the teen - who had previously pledged allegiance to the Islamic State group (IS) - confessed that he "intended to carry out an attack using explosives and knives". Swift's three sold-out shows at the Ernst Happel Stadium were cancelled. More than 195,000 people had been expected to attend.