This is a significant gain by the Taliban after it intensified operations from May 1 as the US began the final stages of troop withdrawal.

As the Taliban seized the area, security forces guarding the border, fled across the frontier abandoning their posts, said an Al Jazeera report.

An army officer, who did not want to be named, was quoted as saying by AFP news agency: "We were forced to leave all check posts and some of our soldiers crossed the border into Tajikistan.

"By the morning the Taliban fighters were everywhere, hundreds of them."

Taliban's fighters have seized the border crossing across the Pyanj river, its spokesperson Zabiullah Mujahid confirmed, according to Al Jazeera.

“Our Mujahideen are in full control of Shir Khan Bandar and all the border crossings with Tajikistan in Kunduz,” he told AFP.

Kunduz provincial council member Khaliddin Hakmi said the Taliban captured Shir Khan, the town and all the border check posts after an hour of fighting on Tuesday morning.

As Taliban captures more territories in Afghanistan and US and NATO move out of the country, there has been an urgent need to find a negotiated end to the bloody conflict that has lingered over decades.  

The impasse between Taliban and the Afghan government continues as talks between the two sides in Qatar are yet to make a breakthrough.

The UN special envoy on Afghanistan warned that Taliban have seized more than 50 to 370 districts since May posing security threats for many countries, near and far.