Tunis:
Four Tunisian soldiers were killed and 11 others were wounded on Wednesday in an attack by suspected Islamist militants on a bus carrying soldiers in Kef near the Algerian border, the Defence Ministry said.
The attack came while Tunisia was preparing its first free presidential election on November 23 and only ten days after parliamentary elections won by secular party Nida Tounes.
Tunisia has struggled to subdue hardline Islamists and jihadis opposed to the transition to democracy following the revolt against former President Zine El Abidine Ben Ali. The military cracked down on militants in the run-up to the polls.
"Terrorists attacked a bus carrying military personnel ...Four soldiers were killed and 11 others were wounded in the attack in Kef city," ministry spokesman Belhassan Ouselati said.
Ouselati said the gunmen tried to climb onto the bus to kill all the soldiers but the soldiers returned fire, prompting them to escape toward the mountains.
Among militant groups operating in Tunisia is Ansar al Sharia, which the United States considers a terrorist organisation and accuses of orchestrating the storming of the US embassy in Tunis in 2012.
Tunisia has long been a source of jihadis in foreign conflicts, from the Afghan wars against the Soviet Union to the Iraq war after the 2003 US invasion.
Prime Minister Mehdi Jomaa told Reuters last month Tunisia had arrested some 1,500 suspected jihadists this year, among them hundreds who fought in Syria's civil war and could pose a danger at home after their return.