The suspects, identified as Muhammad Idress, Umar Farooq, Mirza Naeem Baig and Allah Ditta, are accused of fleecing common people and receiving millions of rupees from them for smuggling them to foreign countries.
According to an FIA spokesperson, accused Mirza Naeem Baig received Rs7.2 million from a citizen for taking him to Italy but later left that person stranded in Libya.
Accused Allah Ditta also minted millions of rupees through this illegal business.
The accused failed to smuggle people to Europe and went into hiding after receiving large sums of money from them.
The FIA launched a massive crackdown against human smugglers and traffickers after Prime Minister Shehbaz Sharif took notice of boat capsizing incidents near Greece in November last year in which illegal Pakistani immigrants were among the people who lost their lives.