The announcements came after rival protests for and against the Islamist-led coalition government, with the opposition demanding the resignation of the cabinet and the dissolution of the National Constituent Assembly.
The calls have mounted since the murder nearly two weeks ago of opposition MP Mohamed Brahmi, the second anti-government politician gunned down in Tunis after Chokri Belaid was assassinated in February.
Officials have said the same gun was used in both killings and pointed the blame at jihadists.
He also called for jihadist militants hiding out near the Algerian border to surrender.
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"Hand over your arms, turn yourselves in to police, and then police and society will take that into account," he said, quoted by state news agency TAP.
The interior ministry, meanwhile, said the dawn raid targeted a house in the southern Tunis suburb of Ouardia where a group of "key terror" suspects was hiding.
"One of the members of the group was eliminated in an exchange of fire, and four were arrested," the ministry said in a statement.
Overnight, the ministry said police had foiled a new bid to assassinate a political figure and that two "very dangerous terrorists" had been arrested and guns and grenades seized.
The ministry did not identify the target of the plot but said it had taken place in Sousse, 140 kilometres south of Tunis, on Friday.
Police traded fire with gunmen after searching a house in the area, and a third suspect fled, it added.
During this raid, a suspect in Brahmi's murder, Lofti Ezzine, was apprehended, Jeddou said.