Hundreds of people queued from the early hours outside UK shops selling the latest edition of French satirical magazine Charlie Hebdo.
It comes as around 10 people have been arrested and questioned over the "possible logistical support" they may have provided three gunmen who carried out last week's attacks in Paris, Agence France-Presse reports.
Pope Francis has weighed into the debate over French satirical magazine Charlie Hebdo, saying it was wrong to provoke others by insulting their religion.
"You can't provoke, you can't insult the faith of others, you can't make fun of faith," he told reporters.
The Pope, who has condemned the Paris terror attacks, stressed that freedom of expression should not offend.
To illustrate his point, he turned to an aide and said: "It is true that you must not react violently, but although we are good friends if Mr Gasparri says a curse word against my mother, he can expect a punch, it's normal."
"Many people who speak badly about other religions, or religion, who make fun of them, make other people's religions a joke well, that is a provocation."
About 7,000 French Jewish people left the country last year and have moved to Israel because they did not feel safe.
The aunt of a man killed while trying to overpower gunman Amedy Coulibaly has told ITV News her family is fearful of their future in France.
A Muslim cleric in Pakistan has held a ceremony to honour Cherif and Said Kouachi, the two men suspected of the Charlie Hebdo massacre.