The United States says there is evidence linking the Pakistani government to the Haqqani network which attacked the US embassy in Kabul last Tuesday.
US Ambassador Cameron Munter said on Radio Pakistan:
''Let me tell you that the attack that took place in Kabul a few days ago, that was the work of the Haqqani network.
"There is evidence linking the Haqqani network to the Pakistan government. This is something that must stop.
"We have to make sure that we work together to fight terrorism."
However, when asked to provide evidence of the link with the Pakistani government, Mr Munter said only "we believe that to be the case".
The ABC reports the Haqqani network is closely allied to the Taliban.
The group is believed to be based in Pakistan. It has been blamed for several attacks against Western, Indian and government targets in Afghanistan.
