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.