Afghan intelligence sources have told Al Jazeera that four senior members of the Taliban movement have been captured in Pakistan.
The men were arrested in Quetta, the capital of Baluchistan province near to the border with Afghanistan, the sources said on Sunday.
The men are believed to include two senior aides to Mullah Omar, the Taliban leader, his chief of staff and the group's head of communications.
Pakistan's security services have refused to confirm the reports.
Mullah Omar has not been seen since 2001 when he fled after US-led forces pushed the Taliban out of power in Afghanistan.
In January, Afghan authorities released a videotape of a captured alleged Taliban spokesman in which he said that Mullah Omar was living in Quetta under the protection of the Pakistani security services.
Islamabad has denied hiding the Taliban leader and repeatedly says it is working to stop the group from operating in southwestern Pakistan.
Hundreds of thousands of Afghan refugees live in the province making it easy for Taliban members to hide among them.