Leftist liberals accuse that security agencies or militants might be behind the forced disappearances though nobody has claimed responsibility for the abduction.
Protest rallies were held in Islamabad, Karachi and Lahore, where journalists, civil society supporters and rights activists demanded urgent measures to find the four missing activists.
The missing activist include Salman Haider, a poet and university professor, who disappeared on Friday here. Two days before bloggers Waqas Goraya and his cousin Asim Saeed went missing from Lahore.
The disappearance echoed in the Senate, the upper house of parliament, yesterday where opposition pressed government to recover the activists.
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Interior Minister Nisar Ali Khan said that all steps were being taken to recover the missing activists.
"Safe recovery of the missing social activists is a priority of the government," Kahn said while briefing lawmakers in Senate on the missing activists.
"The government neither pursues the policy of getting its own citizens disappeared nor will tolerate this," Radio Pakistan quoted the minister as saying.
Human Rights Commission of Pakistan and Human Rights Watch expressed serious concern over the disappearance of the activists and asked Pakistan government to locate them.