U.S. lenders already facing intense scrutiny from lawmakers and regulators over questionable foreclosure practices will likely face class-action lawsuits on behalf of thousands of homeowners nationwide.

Bruce Simon, a class-action attorney with Pearson Simon Warshaw & Penny LLP in San Francisco, said a filing from his firm is imminent, while two other prominent firms said they were also exploring filing class-actions.

So far, most of the courtroom activity over reports of shoddy documents used by lenders in foreclosure proceedings has come in the form of defenses mounted by individual homeowners, or limited class actions filed in state courts.

However, a lawsuit on behalf of homeowners nationwide could seek a court order that would suspend foreclosures much more broadly, class-action lawyers said.

"We are all hands on deck at the moment,'' said Simon of Pearson Simon Warshaw & Penny.

Another firm, Lieff Cabraser Heimann & Bernstein LLP, in San Francisco, is set to decide "within the next two weeks'' whether to file a lawsuit, according to Eric Fastiff, a partner there. He said the firm, which is on the steering committee for BP Plc oil spill litigation and also plays a leading role in lawsuits against Toyota Motor Corp over acceleration problems, currently has five attorneys and two paralegals assigned to the foreclosure issue.