Iran says it will send forces into Pakistan to free kidnapped border guards if Islamabad does not take measures to secure their release.
Interior Minister Abdolreza Rahmani Fazli was quoted as issuing the warning on February 17.
Fazli's comments come a week after Jaish-ul Adl, a little-known Sunni Islamist Baluch militant group, published pictures on its Facebook page it said were of the soldiers kidnapped in Iran's southeast province of Sistan-Baluchistan.
The Iranian Foreign Ministry reportedly summoned Pakistan's charge d'affaires, demanding that Islamabad "act firmly against the leaders and members of the terrorist group who have fled into Pakistan."
Jaish-ul Adl said in November 2013 it assassinated a local Iranian prosecutor, and in October it ambushed border guards, killing 14.
Based on reporting by AP and Reuters