Taliban militants breached the perimeter of a huge former US and British base handed over to the Afghan army last month and were fighting soldiers there on Saturday.
The attack highlights the challenges facing Afghan security forces as foreign troops are gradually withdrawn and the emboldened Taliban launch more attacks.
The militants and army forces were exchanging sporadic gunfire Saturday at Camp Bastion in the southern province of Helmand as fighting continued for a third day, said General Ayatullah Khan, commander of the army regiment in the area.
A few dozen Taliban fighters with automatic weapons and suicide vests attacked the base on Thursday, Khan said.
“Some managed to get inside, took position, and started the gunfight,” Khan said, adding that the insurgents appeared to be holed up at an inner facility called Camp Boston.
The gun battle was still underway on Saturday evening, said Omar Zwak, a spokesperson for Helmand’s governor.
At least five Afghan soldiers died in fighting on Friday, Zwak said earlier. He said 26 of the insurgents were killed on Friday, but a few fighters remained.
“Today, they are fighting from a different direction, which shows more fighters are inside the base,” Zwak said on Saturday.
Camp Bastion was handed over to the Afghan military as part of the coalition’s withdrawal of most foreign troops by the end of 2014.
Elsewhere in Helmand, a Taliban suicide bomber attacked an army checkpoint in the heavily contested district of Sangin, killing at least five soldiers, said Hayatullah, an army commander in the region.