Tunisian police killed seven Islamist militants, including a senior commander wanted for the assassination of two opposition leaders, after a clash outside Tunis where the armed group had stashed arms and bomb belts.

The raid was one of the deadliest since Tunisian forces cracked down on the banned Islamist militant movement Ansar al-Sharia, whose leader declares allegiance to al-Qaeda, and which Washington lists as a foreign terrorist group.

Gun battles broke out late on Monday night when police surrounded a house in the Raoued suburb north of Tunis, leaving one police officer and seven militants dead, the Interior Ministry said, without naming the group.

Among those killed was Kamel Ghadghadi, a senior member of the Ansar al-Sharia, wanted for killing seven soldiers, some of whom had their throats slit, and for assassinating opposition leaders Chokri Belaid and Mohamed Brahmi.

This is the best present for Tunisians

“Ghadghadi is among those killed. This is the best present for Tunisians a year after the murder of Belaid,” Interior Minister Lofti Ben Jeddou told reporters at a news conference.

Ansar al-Sharia was one of the more radical movements to emerge after Tunisia’s 2011 uprising ousted president Zine El-Abidine Ben Ali, whose autocratic regime suppressed and jailed Islamist leaders.

The rise of ultra-conservative Salafi movements who promote the establishment of an Islamic state has alarmed many in Tunisia, one of the most secular nations in the Arab world with a strong tradition of liberal education.

Ansar al-Sharia was blamed for storming the US embassy in Tunis in late 2012. The moderate Islamist government at the time declared Ansar al-Sharia a terrorist organisation after accusing the group of murdering the opposition leaders.

Three years after its Arab Spring uprising, Tunisia is led by a caretaker government that took over after Islamist Ennahda party stepped down in a compromise to end a crisis sparked in part by the killing of Belaid and Brahmi.

Tunisia formally celebrates a new constitution on Friday, with French President Francois Hollande and other dignitaries invited to the ceremony to mark the North African country’s progress to democracy.

The threat of Islamist militancy is among the new government’s main challenges. A suicide bombing at a beach resort late last year – the first such attack in a decade – underscored Tunisia’s vulnerability to jihadi violence.

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