Treasury officials wanted to call in police to determine how some of their documents were leaked, ITV News political editor Tom Bradby understands, although this has now been ruled out.
The situation is bad enough for David Cameron and Nick Clegg to have met today to try to bring a halt to the tit-for-tat leaking.
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Billionaire Microsoft co-founder Paul Allen has claimed discovery of the Japanese battleship Musashi that was sunk by the US Navy in 1945.
Friday will be mostly dry with sunny spells for much of the UK. Temperatures will be mild across the country.