The new Pakistani government has to do "more" to stabilise the border with Afghanistan not only because of concern to the United States but also to address the threat posed to Islamabad, Secretary of State Condoleezza Rice has said.

"It''s very clear that more has to be done to stabilise that border between Afghanistan and Pakistan. More has to be done," Rice said on the Late Edition of CNN aired on Sunday.

Asked if Islamabad is not doing enough the top State Department official once again said "more has to be done".

"... But more has to be done, not just because of Afghanistan''s security, not just because of concerns about threats to American interests, but because of threats to Pakistan. We''re talking about a place in which militants have killed Benazir Bhutto."

"They''ve carried out attacks near the Red Mosque. They''ve carried out attacks on Pakistani soldiers and so Pakistan has a very strong stake in dealing with the places militants are able to gather, train and carry out their activities," Rice said.

The Secretary of State was also asked to comment on a comment by presumptive Democratic nominee Barack Obama that he will send at least two additional brigades to Afghanistan and use this commitment to see great contributions and fewer restrictions from NATO allies.