US warplanes have pounded the Afghan capital, Kabul, in the heaviest attacks so far in the so-called "war against terrorism".

In the biggest attack so far against Kabul, US jets pounded the Afghan capital tonight.

US warplanes began a fourth straight night of attacks as soon as darkness fell in Afghanistan.

There are reports that anti-aircraft fire has been heard for the fourth straight night in the Afghan capital of Kabul.