Federal regulators are probing whether several big banks deliberately mispriced mortgage bonds in the years following the financial crisis, The Wall Street Journal reported, citing people close to the inquiry.
The new investigation is a potential blow to the banks as they have already paid billions of dollars in penalties and fines to various federal agencies following scrutiny of their conduct leading up to and during the market panic of 2008.
Banks continued to hold billions of dollars in hard-to-price assets on their books even in the aftermath of the credit crisis.
(Read more: JPMorgan 'failed and failed miserably': Bharara)
Regulators are now seeking information about whether banks made "significant misrepresentations" about some of those assets to make deals, the Journal said.