Labour's Tom Watson MP said:
"Today's developments show this is no longer only about phone-hacking.
"It goes to the very heart of corporate governance of the company led by Rupert Murdoch.
"Experience shows the company were aware of wrong-doing before it was forced into the public domain by police or civil action but there are now more questions that must be answered.
"Was Sun editor Dominic Mohan aware of allegations of payments to police before he gave evidence under oath to Lord Leveson?
"If it transpires that Will Lewis, chairman of the management and standards committee at News International, has a reasonable suspicion that others were involved in wrong-doing, will he now suspend them rather than wait for more collars to be felt by the police?"