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Police inspect the wreckage of a bus that was transporting Tunisia’s presidential guard in central Tunis on Tuesday. Image Credit: AFP

Tunis: The attack on a Tunisian presidential guard bus that killed 13 was a suicide bomber carrying a backpack who blew himself up getting into the vehicle, a government official said on Wednesday, citing an investigation.

“According to the preliminary details, the attacker was wearing a bag on his back. He had on a coat and was wearing headphones. He blew himself up just getting into the door of the bus with military explosives,” Hisham Garbi, a presidential security official, told local Shems FM radio.

At least 13 people were killed in Tuesday’s bombing of a Tunisian presidential guard bus in central Tunis, prompting the government to declare a state of emergency and tighten security around the capital.

Troops and armed police patrolled the city streets and set up checkpoints searching vehicles and pedestrians. At Tunis international airport security forces were allowing in only passengers travelling.

Tuesday’s blast on a main boulevard was the third major attack on Tunisia this year following the gun assaults on a Sousse resort hotel in June and the Bardo Museum in Tunis in March, both claimed by Daesh. Officials had earlier put the death toll at 12.

“This is a new type of attack that targets the prestige of the state, such as the symbol of the presidential guard,” said presidential security official Hisham Garbi. “We are facing a real challenge with an attack right in the city centre.” No group immediately claimed responsibility for Tuesday’s attack.

President Beji Qaid Al Sebsi was due to hold a national security meeting on Wednesday. On Tuesday he declared a month-long state of emergency giving the executive and the security forces temporarily more authority.

Tunisia has been praised for its democratic progress since its 2011 uprising ousted autocrat Zine Al Abidine Bin Ali.

But fighting Islamist militants has become a major challenge for a country heavily reliant on tourism for its revenues. More than 3,000 Tunisians have left to fight for militant groups in Iraq, Syria and neighbouring Libya.