Tunisian President Beji Caid Essebsi promised a merciless "war against terrorism" after gunmen killed 22 people, including 20 tourists, at the national museum in the capital Wednesday.
"I want the Tunisian people to understand that we are in a war against terrorism and that these savage minorities do not frighten us," he said in brief remarks on television.
"We will fight them without mercy to our last breath."