Two people have been seriously hurt in a knife attack in Paris near the former offices of the satirical magazine Charlie Hebdo, officials say.
A suspect has been detained in the nearby Bastille area. A second suspect has also been arrested, reports say.
Anti-terrorism police have taken over the investigation.
A security cordon has been set up in the 11th arrondissement in eastern Paris. The public were told to avoid the area.
A blade – described as a machete or a meat cleaver – was recovered at the scene of the attack near the Boulevard Richard-Lenoir.
One of the arrested suspects was detained with blood on his clothing, a police source told the BBC.
Initial reports said that four people had been wounded.
The attack comes as a high-profile trial is under way in Paris of 14 people accused of helping two jihadists carry out the 2015 attack on Charlie Hebdo, in which 12 people were killed. (BBC)