Tunisian security forces found on Thursday a car bomb in the central city of Sidi Bouzid, a day after clashes with militants there left six police members killed.
No information was available about the situation at the scene of the firefight, although several sources in the region indicated that the armed group was still at large.
Five burials took place Sidi Bouzid and in Kasserine near the Algerian border, with the sixth funeral held in Kef in northwestern Tunisia.
A military source in Kasserine told AFP that the families of the victims were refusing the presence of government representatives at the funerals.
Dozens of police trade union activists drove Prime Minister Ali Larayedh and President Moncef Marzouki away from a memorial service last Friday for the two policemen killed in Beja, west of the capital.
Many in the security forces have vented anger at the inadequate resources for combatting militant groups.
Marzouki has declared three days of mourning for those killed on Wednesday.
The country's Higher Security Council called on Thursday for the army and the National Guard forces to help the police fight Islamist militants.
The Regional Labour Union in Sidi Bouzid called for a general strike on Thursday to denounce the violence.
Tunisia has suffered a wave of deadly attacks blamed on jihadist militants since the ouster of veteran strongman Zine El Abidine Ben Ali in 2011.
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