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Tunisian security forces stand guard outside the National Bardo Museum in Tunis on March 19, 2015, in the aftermath of an attack on foreign tourists. Tunisia's president promised to wage a 'merciless war against terrorism' after gunmen killed at least 17 foreign tourists and two Tunisians in a daylight attack in the birthplace of the Arab Spring.
Tunisian security forces stand guard outside the National Bardo Museum in Tunis on March 19, 2015, in the aftermath of an attack on foreign tourists. Tunisia's president promised to wage a 'merciless war against terrorism' after gunmen killed at least 17 foreign tourists and two Tunisians in a daylight attack in the birthplace of the Arab Spring.

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    ISIS claims responsibility for Tunisia attack

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ISIS claims responsibility for Tunisia attack

Authorities announced nine people have been arrested, four directly linked to the attack in Tunisia. CNN's Barbara Starr reports.

ISIS claims responsibility for Tunisia attack

Authorities announced nine people have been arrested, four directly linked to the attack in Tunisia. CNN's Barbara Starr reports.