Police have launched a terror investigation after an attack in Paris.
The parents of a man - who killed a person in a knife attack last night - are being questioned by French police.
Officers shot dead the Russian-born attacker, who also injured four others in the stabbing near the city's opera house.
Islamic State's claiming he's one of its 'soldiers' and witnesses say they heard him shout "Allah Akbar".
An eyewitness, named as Gloria, told AFP news agency: "We didn't know what was going on, we were quickly moved inside the bar, I went outside and I saw a man lying on the floor."