BBC NEWS | Americas | US rethinks Afghanistan strategyUS President Barack Obama has confirmed a fundamental rethink of US strategy in Afghanistan and Pakistan to combat an "increasingly perilous" situation.
He said growing radical forces in the area posed the greatest threat to the American people and the world.
He said an extra 4,000 US personnel would train and bolster the Afghan army and police, and he would also provide support for civilian development.
The Afghan government said it welcomed "all [Mr Obama's] major conclusions".
In particular, it said it welcomed the "the recognition of the regional aspect of the problem in Afghanistan and specifically recognition that the al-Qaeda threat is mainly emanating from Pakistan," said presidential spokesman Humayun Hamidzada, according to Reuters news agency.