A roadside bomb went off as a national guard patrol passed south of Tunis early on Wednesday without causing any casualties or damage

A roadside bomb went off as a national guard patrol passed south of Tunis early on Wednesday without causing any casualties or damage, a commander said.
  
The remote-controlled bomb struck at 12:45 am (2345 GMT Tuesday) near Mhamdia, 30 kilometres (20 miles) from the capital, the town's guard commander Mohamed Jouhri told Shems-FM radio.
  
"This section of road is well-known for its 24 hour a day patrolling by the national guard, and the bombers were aware of that," Jouhri said. The bombing came as Tunisia held three days of national mourning for eight soldiers slain by militants near the Algerian border.
  
The soldiers were found on Monday with their throats slit after they were ambushed by an armed group in Mount Chaambi near the Algerian border where the army has been tracking Al-Qaeda militants.