Security sources say dozens of soldiers have been killed in the ongoing clashes in which militants using night-vision goggles launched simultaneous raids on several Afghan military bases and posts in Dashte Archi district in Kunduz province .
Taliban attacks on Afghan security forces in the country's north have caused "heavy casualties," officials said on Thursday, putting the number of soldiers killed as high as 40 in ongoing fighting.
Militants using night-vision goggles launched simultaneous raids on several Afghan military bases and posts in Dashte Archi district in Kunduz province overnight, defence ministry spokesman Mohammad Radmanish and other Afghan security sources said.
"We have suffered casualties, the Taliban have also suffered casualties," Radmanish said.
Between 10 and 15 Afghan soldiers had been killed so far, and about the same number wounded, he added.
But an Afghan security source said, the death toll among security forces was "more than 40," and another confirmed that 39 had been killed and 10 wounded.
A separate security source said there had been "heavy casualties" among the soldiers.
An air and ground operation against the Taliban was underway, Radmanish said.
The night-vision goggles used in the latest attacks helped the Taliban fighters execute their pre-dawn raid, a senior Afghan commander said.
He said the attacks were carried out by the group's elite Red Unit.
"Since we don't have the night-vision (goggles), the Taliban can get close to soldiers without them noticing," he said.
Taliban have stolen armoured Humvees, weapons and other equipment – including night-vision goggles – in previous raids on Afghan security forces, helping them to carry out devastating attacks.
Mohammad Hanif Rezayee, a spokesman for the 209 Shaheen Army Corps in the north, said two military posts had fallen to the Taliban, but security forces had managed to beat back an attack on a base.
In a separate incident, Afghan forces launched air strikes on a gathering of high-ranking Taliban members in the southeastern province of Ghazni, killing 24 and wounding 17, the defence ministry said in a statement on Thursday.
Mullah Amir Khan Mutaqi, who was a Taliban minister during its 1996-2001 regime, and the Taliban shadow governor for Ghazni were among those injured in the attack in Nawa district, the defence ministry said.
Calls for peace
In early April an Afghan air strike on an outdoor religious gathering in Dashte Archi killed or wounded 107 people, mostly children, a UN report released in May found.
The Taliban vowed revenge for the attack, which the government and military said had targeted a Taliban base where senior members of the group were planning attacks.
A recent ceasefire between Afghan security forces and the Taliban during the Islamic holiday of Eid had raised hopes that an end to hostilities in the war-weary country was possible.
Both sides expressed a deep fatigue with the conflict as they celebrated the ceasefire with selfies and hugs in the streets.
Since then, however, the Taliban has returned to the battlefield, launching deadly attacks against the Afghan military across the country.
The latest attacks come as President Ashraf Ghani attends a NATO summit in Brussels where he will be hoping to get a greater commitment from members to the nearly 17-year conflict.
Currently, there are about 14,000 US troops in Afghanistan, providing the main component of the NATO mission there to support and train local forces.
On Wednesday, more than 100 Muslim scholars from around the world meeting in the Saudi holy city of Mecca issued an urgent appeal for peace in Afghanistan.
So far the Taliban has not responded to Ghani's offers for dialogue, instead demanding to sit down with the United States, which has dismissed this proposal.