The Taliban has said it is changing its strategy in its campaign against the NATO-assisted government forces in Afghanistan by targeting the capital, Kabul.
A Taliban spokesman told the BBC in a phone interview that it was adopting the same tactics in Kabul as has been used by insurgents in Iraq.
The spokesperson conceded that NATO had infiltrated its structure in southern Afghanistan and had killed two of its leaders.
Separately, the UN Secretary-General, Ban Ki-moon, has strongly condemned the recent spate of deadly attacks in Afghanistan.
In a statement, Mr Ban urged the Afghan government and the international community to take the necessary measures to address the security situation.
Meanwhile, a soldier with the NATO-led International Security Assistance Force was killed and four others were injured when their vehicle hit a landmine in eastern Afghanistan.
The 37-nation force did not say exactly where the incident happened, or give the nationality of the soldier killed, although most of the soldiers in eastern Afghanistan are part of the US forces.
92 foreign soldiers have now died in Afghanistan this year, most of them in combat. About half are from the US, which has the most soldiers in the international operation in Afghanistan.
Three Canadian soldiers were killed yesterday when a bomb blast struck their vehicle in southern Afghanistan.
