The incident took place in Kech district in southwestern Baluchistan province, which shares a long lawless border with Afghanistan and Iran.
The Pakistani military said attackers from Iran killed four of its border patrol soldiers.
“A group of terrorists operating from the Iranian side attacked a routine border patrol of Pakistani security forces operating along the border between Pakistan and Iran,” the ISPR military media outlet said in a statement Saturday.
“Necessary contacts are being established with the Iranian side to act effectively against terrorists on the Iranian side and prevent such incidents in the future.”
The incident took place in Kech district in southwestern Baluchistan province, which shares a long lawless border with Afghanistan and Iran. No one has claimed responsibility.
Pakistan and Iran share more than 900 km (45 mi) of border. There have been multiple security incidents in the past.
Rebel Baluch nationalist groups in the area say they are fighting for a larger share of regional resources. The Baluch groups operate on both sides of the border.
In January, at least 13 people were injured after an explosion on a passenger train in the Bolan district of the province.