Islamabad lodged a strong protest with Tehran for not taking action against the group responsible for the attack on Makran Coastal Highway.
At least 14 people were killed were after being offloaded from buses.
Around 25 unidentified attackers in Frontier Corps uniforms shot dead 14 passengers including Pakistan Navy personnel.
The protest was lodged through a letter sent to the Iranian embassy in Islamabad.
It was said in the letter that Iran despite being informed by Islamabad’s intelligence apparatus took no action against the terrorist entities.