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.
New amateur video has emerged showing the Charlie Hebdo gunmen, Said and Cherif Kouachi, shooting at police after the attack.
The brothers can be seen next to a black car on a street near the magazine's offices.
One of the men shouts: "We have avenged the Prophet Mohammed," and "al Qaeda Yemen"; before they both reload their automatic weapons and start to drive the car down the narrow street.
But their path is blocked by a police car which arrived with blue lights flashing. Both men then get out of their car to fire at the police vehicle, which rapidly reverses away from the scene before halting about 200 metres away.
After seeming to hesitate, the black car bears down on the police with one of the men appearing to hang out of the passenger's window firing at the police.
The police car remains motionless as the attackers' car draws alongside before turning left and vanishing from sight.
It is thought the police car was struck by several bullets but the officers inside were unhurt.
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.