BBC: US President Barack Obama has warned bankers against complacency, saying that some in the industry are ignoring the lessons of the financial crisis.
"We will not go back to the days of reckless behaviour and unchecked excess at the heart of this crisis," he said.
He called on Wall Street to support "the most ambitious overhaul of the financial system since the Great Depression".
The financial system was returning to normal but had not recovered, he added.
"There are some in the financial industry who are misreading this moment," said President Obama in a speech to mark one year since the collapse of Lehman Brothers bank.
"Instead of learning the lessons of Lehman and the crisis from which we are still recovering, they are choosing to ignore them. They do so not just at their own peril, but at our nation's."
He told Wall Street that it could not resume taking risks without regard for consequences and said they should not expect US taxpayers to bail them out again.
The speech came as UK Prime Minister Gordon Brown said that he was "appalled" that some financial firms had been continuing or even extending their bonus culture.
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