Four injured in knife attack near Charlie Hebdo's former offices in Paris

Two people are in a critical condition after a knife attack near the former offices of satirical newspaper Charlie Hebdo in Paris and a suspect has been arrested, police have said.

Paris police headquarters told local media the two were in a critical condition but their lives were not in danger. Two other people were less seriously wounded. Only one attacker was involved, police said, rather than two as first thought.

A man reportedly wearing bloodstained clothing was detained near the Place de la Bastille in eastern Paris shortly after the attack, police said. All schools in the area were placed in lockdown as a security measure.

A suspicious package found in the area was examined by police scientists and found not to contain any explosive device.

It is unclear what motivated the attack on Friday lunchtime. Charlie Hebdo has moved from its previous address on the rue Nicolas-Appert since an attack by Islamist extremists in 2015 in which several of its editorial staff were among 12 people killed.

The trial of 14 suspects accused of involvement in the Charlie Hebdo killings by brothers Saïd and Chérif Kouachi, and a subsequent attack on the Hyper Cacher kosher supermarket, is currently underway in Paris.

The magazine republished controversial cartoons of the Prophet Muhammad, which it first printed in 2006, to mark the start of the trial, saying in an editorial it would “never lie down … We will never give up.”