Asked directly whether he was involved in any of the briefings against colleagues revealed in Damian McBride's forthcoming memoir, Ed Miliband said it is "not my style of politics".
He said that anyone who knows him would agree that he has "never engaged in the factionalism, never engaged in the briefing".
More top news
A look ahead to the forecast for today across the UK.
People have been warned to prepare for cold weather as ice and snow is set to hit parts of the UK.
There is concern that the lack of clean water could add mean more people fall victim to the worst recorded cholera outbreak in history.