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Tunisia investigating bus blast as terror attack
01:10 - Source: CNN

Story highlights

Twelve killed in attack on bus carrying members of Tunisia's presidential guard

ISIS has released a statement claiming responsibility for the attack

Suspected suicide bomber also died

Tunis, Tunisia CNN  — 

Dozens of people have been arrested in Tunisia in connection with this week’s bombing of a bus carrying members of the Tunisian presidential guard, the Interior Ministry said.

Included in the arrests were the suicide bomber’s mother and sister, according to the ministry. Judicial authorities are investigating their connections to the attack.

ISIS has claimed responsibility for Tuesday’s bombing that killed 12 people in Tunis. The body of a suspected suicide bomber was also found.

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The blast hit when the vehicle was parked near a main artery in the capital where guard members are typically picked up and dropped off, according to the ministry.

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The ISIS statement said a suicide bomber blew up his explosive vest on the bus. It contained a photo of the alleged suicide bomber along with the message: “Tyrants of Tunis must know that they will not be safe, God willing, and we won’t stop until the law of God rules Tunis.”

The Tunisian government has not commented on the ISIS statement. CNN cannot authenticate the ISIS claim.

‘Jasmine Revolution’ sours

Tunisia – the birthplace of the Arab Spring – has been considered a rare success story of a regional uprising that led to a brutal civil war in Syria, a failing state in Libya, a repressive counterrevolution in Egypt and other bleak outcomes.

Last month, the Nobel Peace Prize Committee surprised everyone and awarded the prize award to the Tunisian National Dialogue Quartet for its “decisive contribution to the building of a pluralistic democracy in the country in the wake of the Jasmine Revolution of 2011.”

But the past year has seen a surge in Islamist violence that has raised fears for the future of this North African nation of 11 million people.

In March, 22 people, most of them tourists, were killed in an attack on the Bardo Museum in Tunis.

In June, 38 people, most of them British, where killed when a jihadist gunman went on a rampage at a seaside hotel at a resort in Sousse.

In the wake of the Sousse attack, Tunisian President Beji Caid Essebsi warned that another such massacre would “cause the country to collapse.”

ISIS also claimed responsibility for both those attacks.

Tunisia has contributed the most foreign fighters to join Sunni militant groups such as ISIS in Syria and Iraq, according to a report published by the International Center for the Study of Radicalization and Political Violence this year.

The organization estimated that 1,500 to 3,000 Tunisians were waging jihad in Syria and Iraq, with Saudi Arabia second with 1,500 to 2,500. By contrast, France had contributed the most foreign fighters of any Western country, with 1,200.

The attacks strike at the heart of Tunisia’s beleaguered tourism industry – already struggling to rebound after the upheavals of the Arab Spring. Many Tunisians’ jobs rely on tourism, which accounts for some 15% of the country’s annual gross domestic product, according to a report from the World Travel and Tourism Council.

CNN’s Sara Sidner reported from Tunis, and CNN’s Ed Payne reported and wrote from Atlanta. CNN’s Houda Zaghdoudi contributed to this report.