Photograph of Afghan security forces in Kunduz, a strategic city
A top US commander warned that Afghanistan could fall into civil war if the last American troops are removed from the country.
Since the US left last month, fighting has intensified with the Taliban capturing large swathes.
All US troops remaining are expected to leave the country by September 11, according to all reports.
General Scott Miller stated Tuesday that the country could be facing "very difficult times" if it's leadership fails to unify after international troops leave.
The US-led mission commander in Afghanistan issued the warning just days after the UN warned about "dire scenarios" when the Taliban took control of many districts.
According to the report, insurgents have seized more than 50 out of 370 districts in May. They are now encircling many cities as well as closing in on Kabul.
Gen Miller stated that the security situation was not good at the moment during a rare news conference.
He said, "Civil War is definitely a path that can easily be visualized if this trajectory continues to the trajectory it's currently on." "That should concern the entire world."
He accused the Taliban, he said, of failing to reduce violence according to an agreement it had made with the US.
Experts attribute the militant group's recent capture of more than 100 Afghan districts to US air support.
Gen Miller didn't rule out air strikes by the US against the Taliban.
He stated that he would like to see no air strikes but that if there were no air strikes, all violence must be stopped."
In October 2001, the Taliban were overthrown by US-led forces. Osama bin Laden and other al-Qaeda leaders were residing in this group, which was linked to the attacks on the US on September 11, 2001.
Biden stated that the US pullout was justified because it has made Afghanistan a safe haven for terrorists from abroad.
Continue the story
While Ashraf Ghani, Afghan President, insists that the country's security forces can keep insurgents away from it, many fear that the withdrawal could leave Afghanistan under the control of the Taliban.
Biden pledged that the US would continue to support Afghanistan even after withdrawing troops, but not militarily.
On Tuesday, the last German troops left Afghanistan, ending almost 20 years of involvement in that country.
According to the defense ministry, there have been approximately 150,000 Germans who served in that country since 2001.