Police face being hauled before MPs over claims they failed to release details of an investigation that showed law, telecoms and insurance firms were linked to phone hacking.
The Home Affairs Committee will meet later to consider whether to recall the Serious and Organised Crime Agency (Soca) for questioning about documents reportedly showing it knew about the alleged activities six years ago.
According to a report by the organisation, leaked to The Independent, law, insurance and telecoms companies routinely used criminals and investigators to hack, blag and steal information on business rivals and members of the public.
One hacker admitted that 80% of his client list was made up of such firms, with the remaining 20% attributed to the media, according to the newspaper.
It is understood the Leveson Inquiry did not deal with the claims because its terms of reference were about the culture, practices and ethics of the press and believed any other matters were beyond its remit.
Committee chairman Keith Vaz said it appeared Soca had not provided all relevant documents to MPs and raised fears that "vital evidence" would be lost when the organisation is replaced by the National Crime Agency (NCA).
Mr Vaz said: "When the committee conducted its inquiry into private investigators we asked for all the relevant information from Soca.
"It appears that all these documents were not provided to the committee. I am concerned that with the abolition of Soca vital evidence may be lost in the transfer to the NCA."
He said he was putting the issue on the committee's agenda at a private meeting on Tuesday.