Anti-Taliban internal rebel group Northern Alliance claimed responsibility for the attack last night, a couple hours after the attack. They launched a couple helicopters under cover of night, flew into Kabul, turned on searchlights, tossed some missiles into the munitions area, and left.

[link|http://www.cnn.com/2001/WORLD/asiapcf/central/09/11/kabul.blasts/index.html|CNN story]