News International has ordered the mass deletion of hundreds of thousands of emails from its computer system in the past 18 months, MPs learnt last night.
    		  The news has prompted concerns that vital evidence may have been lost to   police and other authorities investigating the phone-hacking scandal. The   extent of the deletions was revealed in a letter sent to the Commons Home   Affairs Committee by lawyers acting for a technology company, HCL, which   manages data for News International (NI).  
    A shocked Keith Vaz, chairman of the committee, said: "I'm very surprised   that so many emails and information appears to have been deleted since the   start of this year. This will raise further questions which I'm sure we will   want to probe further but it's surprising that such a large number of   messages have been deleted. Several thousand emails is a lot of emails."   He said staff from HCL may be called to give further evidence before the   committee.  
        Stuart Benson, a Reading-based law firm acting for HCL, detailed nine   instances since April 2010 when NI had requested the deletion of emails. The   first three requests were made within weeks of a Commons committee having   castigated the company's executives for their "collective amnesia"   over the extent of hacking by the News of the World.  
    In one of the requests, NI asked for the deletion of more than 200,000 pieces   of correspondence. Another request, made the following month, asked for the   deletion of 21,000 messages said to be "stuck in the outbox".  
    All of the requests for deletions could be due to standard practice in   managing an IT system though other similar businesses said last night that   they retained email archives for much longer. Two of the requests made   references to "public folders" and investigators will want to be   sure that these are not ruses used to disguise the identity of the user.   
    Scotland Yard detectives, who are examining the NI information systems for   evidence of phone-hacking and illicit payments to police, are likely to be   angry at any attempt to interfere with the archive, particularly since   January this year when NI stated publicly that it was doing everything in   its power to co-operate with the inquiries. Three of the requests for email   deletions were made in 2011.  
    MPs who have led the campaign for a full investigation into hacking expressed   their concern last night. Tom Watson, the Labour MP for West Bromwich East,   said: "Sadly this is not a surprise but it's a shocking revelation and   casts further doubt on the leadership of the previous investigation by the   Metropolitan Police. I sincerely hope this means the police will now   consider News International an unco-operative partner in trying to crack the   cover-up of hacking."  
    Chris Bryant, Labour MP for Rhondda, said: "Some of us called from the   very beginning for the Met to go in and seize the whole of the IT system.   From what we have heard it seems we may never get to the bottom of how News   International ..., in the words of the police, 'deliberately thwarted the   investigation'."  
    In his letter to the committee, HCL's solicitor, Stuart Benson, said: "It   is of course a matter entirely for News International, the police and your   committee as to whether there was any other agenda or subtext when issues of   deletion arose and that is a matter on which my client cannot comment and   something which you will no doubt explore direct with News International." 
    Last night, News International made no comment on the letter.  
    News of the deletions follows a report in The New York Times that Harbottle &   Lewis, a London law firm working for NI, had redrafted more than once a   letter it sent to the Commons Culture Committee in May 2007, in effect   clearing the company over further involvement in hacking. The Harbottle &   Lewis letter said "no reasonable evidence" had been found that   senior editors knew about the reporter's "illegal actions".  
    Next Monday victims of hacking by the News of the World who are bringing civil   actions against the publishing company are due to be given disclosure of all   the information held on them on the company's databases.  
    On the trail of the deleted emails  
    February 2010  
    The Commons Culture Committee publishes a report accusing News International's   executives of "collective amnesia" over the extent of phone   hacking and says it is "inconceivable" senior executives did not   know what was going on.  
      April 2010  
    First instance of email deletion occurs, with request to delete email boxes of   certain people who have left the company. The request is not followed   through as the emails are not impacting on the system. A second deletion   request is made the same month and more than 200,000 delivery failure   messages are deleted. A third request that month is for the deletion of a   public folder by a specific user who "no longer needed older emails".  
      May 2010  
    A fourth request is made for the deletion of a further 21,000 emails which are   said to be "stuck in the outbox". They are deleted.  
      July 2010  
    News International asks for another "public folder" to be deleted as   part of "maintenance work" carried out on folders "no longer   needed".  
      September 2010  
    The New York Times reports that hacking was widespread at the News of the   World. It carries allegations from whistle-blower Sean Hoare, pictured top,   who says such practices were "endemic". The Culture Select   Committee orders a fresh inquiry. NI makes a sixth request for email   deletions. HCL says this was for "pruning the historic email archives".   NI argued that the deletions were needed to "help archival system which   was having frequent outages".  
      January 2011  
    Scotland Yard asks NI for any new material they have regarding hacking. NI   suspends the former News of the World news editor Ian Edmondson. Andy   Coulson resigns from No 10. Met Police announce a fresh investigation. NI   asks HCL about its ability to "truncate a particular database".  
      February 2011  
    Met Police say they have identified more potential victims of hacking. Judge   orders private investigator Glenn Mulcaire, pictured left, to reveal whether   other NOTW journalists knew about hacking. Eighth instance of deletion of NI   emails as company asks to delete duplicate material from users who had   switched systems.  
      July 2011  
    More dramatic revelations including news of the hacking of the murdered   schoolgirl Milly Dowler lead to the closure of the NOTW and the resignation   of NI chief executive Rebekah Brooks. NI asks for a ninth deletion, removing   emails from the live system after "errors occurred" in the   migration from one system to another.