Haqqani leader denies acting for Pakistan intelligence
3 October 2011 Last updated at 04:44 BST
A key leader of the Afghan militant group, the Haqqani network, has told the BBC it was not responsible for killing Burhanuddin Rabbani, the man overseeing Taliban peace talks.
Afghan officials have blamed the Taliban-affiliated network for the suicide attack on Rabbani.
Siraj Haqqani also told BBC Pashto his network was not linked to Pakistan's spy agency, the ISI.
Security considerations ruled out a face-to-face interview in which the answers could be challenged, but the BBC understands that the audio response is genuine.
Nick Childs has the story.