Interior Minister Chaudhry Nisar Ali Khan asked officials to "review" the process of visa issuance to Chinese nationals visiting Pakistan for various projects and maintain a databank of their presence in the country, an official statement said.
Several Chinese nationals have been visiting Pakistan, mainly as workers to participate in massive infrastructure projects connected to the China Pakistan Economic Corridor (CPEC) - being built by Chinese firms and Chinese assistance.
It was not clear what sort of "preaching" they were involved in.
Minister Khan said it was unfortunate that a "misuse of the terms of business visa" led to their death. He ordered the secretary, interior ministry, to investigate the matter.
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The minister said ensuring security of foreign nationals in Pakistan was a "shared responsibility".
Taking note of laxity often shown by Pakistani missions abroad, he said the officials posted there should scrutinise visa applications properly and get necessary details before issuing visas to foreign nationals.