The chairman of Afghanistan's Senate, Fazal Hadi Muslimyar, has confirmed that senators received threats regarding a strategic agreement with United States.
But Muslimyar told RFE/RL on May 19 that the threats would "not affect the approval or disapproval of the document."
A number of parliament members have recently said they have received messages on their mobile phones saying they would be "targeted" if they approved the strategic partnership agreement.
They said the messages had been sent by the previously unknown "Mullah Dadullah Front."
Mullah Dadullah was a senior Taliban commander who has killed in a U.S.-led attack in 2007.
The strategic partnership agreement signed by the Afghan and U.S. presidents
earlier this month covers relations between the two countries when NATO forces pull out in 2014.