"Mortar shells fired by Iranian border guards landed in the district of Panjgoor," a provincial government official said.
Two of the shells landed near Frontier Corps check-post, while the third landed at Killi Karim Dad, the Dawn quoted the official as saying.
No property or human loss was reported in the shelling.
Locals panicked as a result of the attack, and Frontier Corps personnel reached the site to initiate investigations. Security forces tightened security at the border after the incident.
Pakistan shares a 900-kilometre porous border with Iran and the two countries in 2014 decided to boost intelligence coordination to wipe out terrorists from the border region.