Rupert Murdoch has made no mention in his almost daily tweets about the surprise early-morning arrests on Saturday of four journalists, including two senior Editors, working for his London daily, The Sun -- and today's (Tuesday) Guardian newspaper suspects it knows why he has remained silent Murdoch and his son James, as well as News International chief Tom Mockridge and Sun editor Dominic Mohan were never informed that News Corp's own Management & Standards Committee, which is conducting an internal investigatiion of possible misconduct by the company's journalists, were ever informed in advance that the committee had turned over incriminating evidence to Scotland Yard.