The momentum of the military campaign in Afghanistan is firmly with the allies, Tony Blair says.
The British Prime Minister believes the Northern Alliance's seizure of Mazar-e-Sharif is a key point in the conflict.
He was speaking at a meeting of Labour's National Policy Forum at the party's headquarters.
Mr Blair said: "I think it is clear that the momentum is obviously with the international coalition, the Northern Alliance having taken Mazar-e-Sharif and now with the possibility of securing the northern part of Afghanistan."
But Mr Blair told the meeting at Millbank, Westminster, that the coalition still has much work to do in several fields before the campaign will be concluded successfully.
"We have got to work on the other aspects, the military campaign, the political campaign and of course, what is happening on the humanitarian side to make sure that we bring this to a successful conclusion," he said.