Second man arrested after Buckingham Palace sword attack

British police investigating Friday's sword attack outside Buckingham Palace in London arrested a second man on Sunday, as the world-famous Notting Hill Carnival kicked off under increased security measures."The man was arrested on suspicion of being involved in the commission, preparation or instigation of terrorism at 10:15hrs (0915 GMT) today and he has been taken into custody," a police statement said.It came hours after Islamic State jihadists claimed responsibility for Friday's knife attac