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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Leicester City's unlikely Premier League success features on the front pages of many of Tuesday's national newspapers.
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Leicester City players have been celebrating their Premier League title after Spurs drew with Chelsea on Monday night.