Afghanistan has launched a "large-scale" military operation on Pakistani army positions in response to recent strikes carried out by Islamabad, Taliban officials have said.
"Numerous" Pakstani soldiers have been killed and some captured in the offensive launched late on Thursday along their shared border, the group's chief spokesman Zabihullah Mujahid said.
Pakistan's information ministry said the "unprovoked fire" was being met with "immediate and effective response by Pakistan's security forces" and also claimed heavy casualties on the Afghan side.
It comes after Islamabad carried out overnight air strikes on Afghanistan earlier this week, which the Taliban said had killed at least 18 people.
Taliban military spokesman Mawlawi Wahidullah Mohammadi said the "retaliatory operation" had been launched at around 20:00 local time (15:30 GMT) on Thursday.
