Tunisian authorities have arrested more than 20 suspected militants in a nationwide security crackdown since gunmen killed 23 people, mostly foreign tourists, in Wednesday's attack in the capital, the government said.
Hundreds of people gathered for a mass in the cathedral in Tunis on yesterday, lighting candles to remember the victims, who included three Tunisians, in a ceremony attended by government ministers.
Outside, there was a heavy police presence along the central Habib Bourguiba boulevard. But Tunis was calm, with a music festival going ahead in the city centre.
Wednesday's assault, the deadliest involving foreigners in Tunisia since a 2002 suicide bombing on the island of Djerba, came at a fragile moment for a country just emerging to full democracy after a popular uprising four years ago.
Authorities have arrested more than 20 suspected militants, including 10 believed to be directly involved in the Bardo attack, Interior Ministry spokesman Mohamed Ali Aroui said.
The government plans to deploy the army to major cities to improve security following the shootings.
Whoever was responsible, the Bardo attack illustrates how Islamist militants are turning their attention to North Africa. A particular focus is neighbouring Libya, where two rival governments are battling for control, allowing Islamic State to gain a foothold.
In an interview with Paris Match magazine, Tunisian President Beji Caid Essebsi said there were as many as 10,000 young Tunisian jihadists in all.
"Four thousand Tunisians have joined jihad, in Syria, Libya and elsewhere, and some 500 have already come back here, where they pose a threat. That is not to mention the five or six thousand others we have succeeded in preventing from leaving."
The militant group controls large swathes of Iraq and Syria, and claimed responsibility for suicide bombings at two mosques that killed at least 137 people in the capital of Yemen on Friday.
Four years after a popular revolt toppled autocrat Zine El-Abidine Ben Ali, Tunisia has completed its transition to democracy with free elections, a new constitution and compromise politics between secular and Islamist parties.
But the attack threatens to hit the economy of a country that is heavily reliant on drawing foreign visitors to its beach resorts and desert treks. Authorities have tightened security at hotels and tourist spots.
"This attack will have an impact, no doubt. But so far we have only had a small number of cancellations," Tourism Minister Salma Loumi told Reuters. "On the contrary, we are seeing support from Western countries and travel agencies."
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