The Killers have announced they are “conducting a thorough investigation into past and present tour staff” following allegations of sexual misconduct on one of their tours.It comes after a female sound engineer claims she witnessed a woman being abused backstage during their 2009 US tour in a blog posted on her Twitter account.The woman, who is named on her account as Chez Cherrie, wrote: “We were about half way through our load-in when the FOH [front of house] engineer came over [the] radio and