Biden: 'Senseless violence' in Afghanistan must stop

US President Joe Biden on Friday said the "senseless violence" in Afghanistan must stop as Taliban fighters continue their offensive on government-held territories.

Biden reiterated that US support for the Afghan government and its forces will not diminish as he hosted Afghan President Ashraf Ghani and Chairman of the High Council for National Reconciliation Abdullah Abdullah at the White House.

The meeting comes as Biden's Sept. 11 deadline for the full withdrawal of US forces rapidly advance with the Taliban launching a bitter campaign against Afghan forces.

Ghani expressed gratitude for Washington's continued support, adding that he respects Biden's decision to proceed with the US exit.

"We are determined to have unity, coherence," he said in the Oval Office, further noting government forces have re-taken six districts from the Taliban today.

Afghan government forces are currently locked in heavy fighting with the Taliban in the key northern city of Kunduz after the group seized the main border crossing with Tajikistan. Intense fighting has also taken place on the outskirts of Mazar-i-Sharif, Afghanistan's fourth-largest city.

The past week has seen several surrenders of Afghan forces to the Taliban with pictures and videos circulating on social media indicating the extremist group's fighters have seized major stockpiles of military hardware and vehicles.

Amid the developments the intelligence community downgraded an earlier assessment that the Afghan government would survive for two years after the US exit with a timeline now of between six months and a year, officials told the Wall Street Journal newspaper.