Tunisia’s army has shelled militant hideouts near the Algerian border as part of a campaign against hardline Islamists seeking to destabilize the North African country’s fragile transition to democracy.

Troops fired heavy artillery after spotting suspicious movements in the Mount Chaambi area on Sunday, army spokesman Taoufiq Rahmouni told the state news agency TAP. It was unclear if there were any casualties.

Concerns about militant violence are increasing as Tunisia takes its final steps to full democracy, three years after its revolution that inspired the “Arab Spring” revolts in Libya, Egypt, Yemen and Syria.