Gunmen stormed Tunisia's national museum, killing 17 tourists of various nationalities and two Tunisians in an attack that raised fears for the birthplace of the Arab Spring.
The brazen daylight assault yesterday sparked panic at the nearby parliament and the National Bardo Museum itself, a magnet for the tourists who contribute so much to the economy.
The gunmen, dressed in military uniforms, opened fire on the tourists as they got off a bus then chased them inside the museum, said Prime Minister Habib Essid.
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The nationality of a 16th victim was not given, while the identity of the final fatality had not yet been established.
Police killed two gunmen and the authorities were still hunting for possible accomplices, said the prime minister.
A Tunisian bus driver and a policeman were also reported dead in the attack on the Bardo, famed for its collection of ancient artefacts.
President Beij Caid Essebsi, who visited some of the dozens being treated for wounds in a Tunis hospital, denounced the "horrible crime".
"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.
"We will fight them without mercy to our last breath."
The government announced 42 people were wounded, with Health Minister Said Aidi saying they included citizens of France, South Africa, Poland, Italy and Japan.
The attack appeared to be the worst on foreigners in Tunisia since an Al-Qaeda suicide bombing of a synagogue killed 14 Germans, two French and five Tunisians on the island of Djerba in 2002.
It sparked outrage, with hundreds of people gathering later in a major thoroughfare of the capital, singing the national anthem and shouting slogans against what they called terrorists.
It also drew strong condemnation from world leaders.
President Francois Hollande expressed French "solidarity" with Tunisia and US Secretary of State John Kerry denounced the "wanton violence".