Verso ballottaggio tra giurista indipendente e magnate in cella
Seggi aperti. Massiccio il dispositivo di sicurezza
No clear frontrunner in race involving 24 candidates vying for the presidency with the struggling economy a main focus.
Alle 13 alle urne il 16%, 20 punti in meno rispetto al 2014
Media mogul's own Nessma TV channel reports 56-year-old was arrested as he traveled to Tunis.
Early indications suggest a low voter turnout against a backdrop of growing frustration with the established parties, and their failure to solve the economic crisis.
Ennahdha projected to win 17.5 percent of the vote, slightly ahead of Qalb Tunes, tipped to secure 15.6 percent.
Originally scheduled for November, the vote was brought forward following President Beji Caid Essebsi's death.
Oltre 15 mila i candidati, esiti incerti
Sunday's election is seen as a test for established parties that have struggled to kick-start country's economy.