Seven in custody after stabbing linked to Charlie Hebdo

A French riot police officer stands guard after the attack (AP)

Seven people including a suspected assailant are in custody after a stabbing outside the former Paris offices of satirical newspaper Charlie Hebdo, French authorities said.

Counter-terrorism officers are investigating what authorities called an Islamic extremist attack linked to Charlie Hebdo, which lost 12 employees in an al-Qaida attack in 2015.