Tunisian forces have launched a land and air operation against Islamist militants near the Algerian border, the military says, as Tunis battles a crisis sparked by a political slaying.
"A huge operation, with ground and air units, was launched at dawn to clean up the (Chaambi) mountain" area, armed forces spokesman Taoufik Rahmouni told Mosaique FM radio on Friday.
He said the assault was mounted after clashes on Thursday night between soldiers and "a terrorist group", referring to fugitive Islamist militants.
"We have not killed or arrested any terrorists" to date, he said, without giving a number for the hunted militants.
A military source on the ground earlier told AFP "the terrorist group is surrounded" in the Mount Chaambi area where eight Tunisian soldiers were slain this week.
He said helicopters had carried out air strikes.
"Either they give themselves up or they will be killed," he told AFP.
He said the attack took place around 16 kilometres from the town of Kasserine, near Mount Chaambi, where the soldiers were found on Monday with their throats cut after an ambush by militants.
Mosaique FM said the raids were aimed at destroying militant hideouts. The explosions could be heard in Kasserine.
Tunisian troops have intensified their hunt for gunmen in Mount Chaambi since the spring, after several members of the security forces were killed or wounded by explosive devices.
A military source also said on Friday that a group of Salafists, a hardline branch of Sunni Islam, were arrested in a Kasserine mosque.
This week's gruesome attack on soldiers has prompted the army in neighbouring Algeria to reinforce its presence along the border.
The latest military operation came as leaders in Tunis opened talks with opposition and civil society representatives to try to defuse the political crisis sparked by the July 25 murder of opposition MP Mohamed Brahmi.
The killing has been blamed on Islamists, with a connection made to the February murder of fellow opposition head Chokri Belaid - the same gun was used in both killings.
Suspects in the Brahmi case have been named but so far no arrests have been announced.
As the political crisis enters its second week, thousands of supporters and opponents of the government have been holding rival street protests every night after breaking the Ramadan fast.
