Wall Street Roundup: Big bank investigation. Toxic asset surprise.

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Slow GDP growth. The Commerce Department announced that it was lowering its estimate for the nation’s economic growth this year, though less than many expected. Responding to the growth slowdown, Federal Reserve chairman Ben Bernanke promised in a speech Friday morning that the central bank would do all it could to help spur growth.

SEC promises more. The Securities and Exchange Commission has vowed to continue going after wrongdoing by banks before the financial crisis, not stopping with its Goldman Sachs settlement.

Big bank investigation. The investigative news service ProPublica is out with its latest in-depth probe of bank behavior before the crisis, this one dedicated to pinning down the trick that banks used to pump up demand for mortgage-backed securities.

Toxic asset surprise. The government is poised to earn back money for taxpayers from toxic assets it bought during the crisis to ease up the credit system.

--Nathaniel Popper