A friend of the Paris knife attacker was arrested in Strasbourg on Sunday.

The police left the building in Strasbourg’s L’Esplanade neighbourhood with a handcuffed man, who was wearing a black T-shirt reading ‘Grozny’, the capital of Chechnya, and depicting a drawing of a Kalashnikov.

French authorities have opened a terrorism investigation into the stabbing attack, which was claimed by the self-proclaimed Islamic State (IS; formerly ISIL/ISIS).

On Saturday evening, the knife-wielding attacker, identified as 21-year-old French national Khamzat Azimov, born in Chechnya in 1997, killed one person and injured four more. The assailant was killed after being shot by police.

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