An Afghan general has warned of "devastating" consequences for global security if the Taliban win in their fight against government forces, APA reports citing BBC.
General Sami Sadat is leading the battle against the Taliban in the southern province of Helmand, where intense fighting has broken out in its capital Lashkar Gah.
At least 40 civilians have been killed there in the past day, the UN says.
The Taliban are reported to have captured most of the city.
However, the fighting is continuing and government forces have vowed not to let Lashkar Gah fall into militant hands.
Gen Sadat told the BBC that while government forces had lost ground, he believed the Taliban would be unable to sustain their assault.
However, he said the Taliban were being reinforced by fighters from other Islamist groups and warned that their gains posed a threat beyond Afghanistan.
"This will increase the hope for small extremist groups to mobilise in the cities of Europe and America, and will have a devastating effect on global security," he said.
"This is not a war of Afghanistan, this is a war between liberty and totalitarianism."
The Taliban assault in Helmand province is part of a major offensive across Afghanistan.
The militants have made rapid advances in recent months as US forces have withdrawn after 20 years of military operations in the country.
Helmand was the centrepiece of the US and British military campaign, and any Taliban gains there would be a blow for the Afghan government.
If Lashkar Gah fell, it would be the first provincial capital won by the Taliban since 2016, when they briefly held the northern city of Kunduz.