Taliban military spokesman Mawlawi Wahidullah Mohammadi said the “retaliatory operation” had been launched at around 20:00 local time (15:30 GMT) on Thursday.
The group’s chief spokesman Zabihullah Mujahid said the offensive had killed “numerous” Pakistani soldiers and captured others.
This was denied by a spokesman for Pakistan’s prime minister, who also contested Mujahid’s claim that 15 military posts had been captured.
Prime Minister Shehbaz Sharif’s spokesman Mosharraf Zaidi dismissed claims of damage on the Pakistani side and said all aggression would receive an “immediate and effective” response.
Mujahid wrote on X that “in response to repeated border violations and insurgency by Pakistani military circles, large-scale preemptive operations were launched against Pakistani army centres and military installations” along the border.