Tunisia's Prime Minister Habib Essid held an emergency cabinet meeting Saturday, after authorities declared a nighttime curfew nationwide following the worst outbreak of social unrest since the 2011 revolution. Five years after the ouster of longtime dictator Zine El Abidine Ben Ali, street demonstrations against unemployment and poverty have again shaken the North African nation. Anger erupted over the death on January 16 of Ridha Yahyaoui, a 28-year-old unemployed man who was electrocuted when he climbed a power pole while protesting in the central town of Kasserine. The unrest spread around the country, including to Tunis where shops were burnt...