In the early afternoon on Friday, two army vehicles bearing men in Afghan army uniforms rolled up to the base's gate, claiming to have wounded soldiers in need of urgent medical care.
At least one armed man continues to resist, he said, with another killed and a third arrested.
Citing information from army officials, Khairandish said 60 soldiers had also been wounded in the attack.
Lately, the U.S. has concentrated on fighting Islamic State (IS, formerly ISIS/ISIL) terrorists in eastern Afghanistan, while also supporting Afghan National Security Forces against the Taliban.
A USA military spokesman said "more than 50" Afghan soldiers were killed in the attack claimed by the Taliban, while Afghan officials put the death toll at eight with 11 wounded.
Military advisers and trainers from NATO's US -led Resolute Support mission in Afghanistan are also stationed at the base.
"When they started hitting other soldiers, we understood that it was a terrorist attack", Zabihullah told Reuters from his hospital bed, wounded by an explosion.
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Central Command spokesman said here today.
A group of Taliban militants had stormed the army's 209-Shaheen Corps in the province at a time when soldiers were either having lunch or saying their Friday prayers in a mosque inside the heavily-guarded compound. There, they began shooting at soldiers as they prayed in a mosque in the compound, Waziri said.
Earlier it had said one of the assailants had been detained.
The insurgents said they had inflicted heavy casualties on the army.
However, Balkh Governor Atta Mohammad Noor said the same day he is concerned about the spread of insecurity in the northern provinces and that it would increase if security forces do not take an offensive stance against militants.
Last month about 50 people were reported to have died when militants believed to be from Islamic State targeted patients and staff at a military hospital in Kabul with guns, grenades and knives.
The attack starkly highlighted the difficulty of the long struggle by the Afghan government and its global backers to defeat the Taliban insurgency. The April 13 attack against the terror group, also known as ISIS or ISIL, in Afghanistan was the first time the weapon has been used in combat.