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.
The Union des Organisations Islamiques de France (UOIF), which represents more than 250 Muslim organisations across France, has condemned the Paris terror killings.
In a statement, it said: "The UOIF condemns, in the strongest possible terms, this criminal attack and these horrible murders and offers its condolences to the families as well as the employees of Charlie Hebdo."
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.