Pakistani authorities late Wednesday accused the Afghan National Army (ANA) of firing on one of its border checkposts, injuring at least two security personnel.
A senior Pakistan security official in the country's northwest said ANA troops started firing at 10:00 pm local time, which triggered an exchange of fire that lasted for two hours on the Pakistan-Afghan border in the Mohmand tribal district.
"It was continuous fire on one of our checkpost that forced our troops to retaliate," the official told AFP.
"ANA was firing with small and heavy weapons. At least two of our security personnel were injured. We will raise this issue on the proper forum," the official said.
An administrative official in the Mohmand district along the Afghan border confirmed the exchange of fire and told AFP five ambulances had been sent to the area.
It is the latest incident in a series of cross-border attacks, which Afghan and Pakistan authorities have traded blame for initiating.
No Afghan official was immediately available for comment.