Afghanistan's intelligence agency says it has given Pakistan evidence that Taliban leaders plotted last month's assassination of government peace envoy, ex-President Burhanuddin Rabbani, in Pakistan.
Interior Minister Bismillah Mohammadi said in parliament on Saturday that a master-mind of the plot - Hameedullah Akhondzada - had been arrested.
He also said Pakistan's spy agency, the Directorate of Inter-Services Intelligence, played a role in the killing on 20 September.
The Taliban leadership council is known as the Quetta Shura. Pakistan denies the existence of any Taliban shura in Quetta.