The Taliban could isolate Afghanistan's capital Kabul in 30 days and potentially take it over in 90 days, a US defense official told Reuters on Wednesday, citing a US intelligence assessment.

Taliban fighters have taken control of eight provincial capitals in six days, a pace that has surprised US officials.

Taliban forces now control 65 percent of Afghanistan and have taken or threaten to take 11 provincial capitals, a senior EU official said on Tuesday.

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Until last month, US intelligence assessments warned that the Afghan government could fall in as little as six months.

The US official, speaking on condition of anonymity, said the new assessment followed the rapid gains the Taliban had been making around Afghanistan.

"But this is not a foregone conclusion," the official said, adding that Afghan security forces could reverse the momentum by putting up more resistance against the insurgent group.

It was not immediately clear if this was consensus view of the intelligence community or if different intelligence agencies had different views, which would not be uncommon.

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US President Biden said on Tuesday that he did not regret his decision to pull US troops out of Afghanistan after more than 20 years, saying the Afghan troops outnumber the Taliban and must want to fight.

The United States has essentially pulled all troops out of Afghanistan, except those staying to protect the US embassy and airport in Kabul, with the military mission set to end on Aug. 31.

First Published:Aug 11, 2021 7:24 PM IST