Six years after being ousted in the US-led invasion, the Taleban have retaken about 10% of Afghanistan, US intelligence chief Mike McConnell says.

The government controlled just 30% of the country, and the rest was under tribal control, the director of national intelligence told senators.

But that assertion has been denied by the Afghan government as incorrect.

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The Committee on Armed Services heard the Taleban's resurgence was due partly to increased support from al-Qaeda.

The last 12 months have seen the worst violence in Afghanistan since 2001.

The head of the US Defence Intelligence Agency told the same committee major problems remained in trying to crack down on the lawless tribal area on Afghanistan's border with Pakistan.

'Vital sanctuary'

Lt Gen Michael Maples said the Pakistani military was not trained for that fight.

He added that it would take three to five years to address those deficiencies and to make a difference.

"Pakistani military operations in the [region] have not fundamentally damaged al-Qaeda's position," Gen Maples said.

"The tribal areas remain largely ungovernable and, as such, they will continue to provide vital sanctuary to al-Qaeda, the Taleban and regional extremism more broadly."

In Washington, independent foreign policy experts have previously warned that Afghanistan largely remains a failing state.

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