Law and Foreign Affairs Minister S. Jayakumar also said the details of the investigations showed "without any shadow of a doubt" that the problem was serious.

CNN: Leaders slam terror plotters

The Shadow Secretary of State, Owen Paterson, said serious allegations have been made.

BBC: Reaction: Robinson revelations

Shadow Treasury minister Chris Leslie said the value and timing of the sale raised "serious questions".

BBC: Northern Rock: Sale good for taxpayers, says government

Treasury minister Liam Byrne accused Mr Osborne of "trying to mislead the public" and said the claims raised "serious questions" about the shadow chancellor's judgment.

BBC: Osborne tax hike claim sparks row