Iranian authorities on Saturday handed over 44 Pakistanis at the Taftan border crossing, Iranian news agency IRNA reported.
Those handed over were arrested from various areas in Iran for staying without valid travel documents.
After completion of procedures, the Iranian border guards handed over the individuals to the Federal Investigation Agency (FIA).
Earlier, Iran handed over 144 illegal immigrants to Pakistan and the two countries are engaged in strengthening cooperation to stop cross-border illegal movements of immigrants.
Iran’s President Hassan Rouhani during a televised news conference with Prime Minister Imran Khan said last April that Pakistan and Iran would form a joint quick reaction force to combat militant activity and illegal migration on their shared border.
Relations between both the countries have been strained in recent months, with both sides accusing each other of not doing enough to stamp out militants allegedly sheltering across the border.