The Pakistani military says dozens of Taliban militants coming from Afghanistan attacked border posts in the northwest, killing four paramilitary soldiers.
The paramilitary Frontier Corps says Monday's attack occurred in Olai, part of the Mohmand tribal area. It said soldiers retaliated, killing 15 militants.
The military said the attacking force included around 60 militants. The information could not be independently confirmed because the area is off-limits to most journalists.
Pakistan has repeatedly complained about Pakistani Taliban militants using Afghanistan as a base to stage cross-border attacks.
Afghanistan and the U.S. have criticized Pakistan for allowing Afghan Taliban militants in the country to stage attacks in the opposite direction.