The discontent spread to several towns in central Tunisia, with demonstrators taking to the streets.
Protests and clashes with security forces started in Kasserine following the death on Saturday of an unemployed man who was electrocuted atop a power pole near the governor's office.
Ridha Yahyaoui (28) was protesting after his name was removed from a list of hires for coveted public sector jobs.
"It's as if we were back in 2010-2011," Al-Shuruk newspaper wrote, referring to the revolution that overthrew dictator Zine El Abidine Ben Ali.
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In the face of this week's burgeoning unrest, Prime Minister Habib Essid cut short a European tour to return home today.
Essid is to chair an emergency cabinet meeting on Saturday and give a news conference, his office said in a statement.
Despite the success of Tunisia's political transition in the past five years, the authorities have failed to resolve the problems of social exclusion and regional disparities.
As on the previous days, protesters today set up roadblocks with burning tyres and pelted security forces with stones, an AFP correspondent said.
In Feriana, 30 kilometres away, a policeman was killed yesterday during an operation to disperse demonstrators, the interior ministry said.
A security source told AFP that he died when his vehicle was overturned.
Today, a crowd of more than 1,000 gathered outside the governor's office in Kasserine demanding information on a government announcement the previous day of plans to create 5,000 jobs.