Four Tunisian police were killed on Tuesday in what the government labeled a "terrorist attack".

Four Tunisian police were killed on Tuesday in what the government labeled a "terrorist attack".
  
"On February 18, following a terrorist attack in Boulaaba in the governorate of Kasserine, four heroes of the National Guard were martyred," the interior ministry said in statement, without giving further details.
  
Boulaaba is part of a mountain range on the Algerian border which is home to Tunisia's main militant group, the Al-Qaeda linked Phalange Okba Ibn Nafaa.
  
The group is blamed for an attack which killed 15 Tunisian soldiers in July while dozens of soldiers and police have been killed or wounded in ambushes by the militant fighters and landmines.