Three people injured in stabbing spree at subway station in Tunis
The National Security District Union of the city told media that the attacker, not described, has been arrested.
The attacker, the union added, tried to assault security personnel looking over the Bab Alioua subway. No one has claimed responsibility for the attack.
The North African country has been in state of emergency since November 2015 following a terror attack on the presidential guard.
President Kais Saied last week extended the security measure for another month.