French forces storm two separate hostage sites in and around Paris on 9 January, killing three hostage takers
Charlie Hebdo suspects Said and Cherif Kouachi killed at a printing warehouse north of Paris
One employee trapped in the printing works was rescued
Hostage-taker, named by officials as Amedy Coulibaly, also killed in assault on Paris supermarket
Four hostages killed and another four seriously injured at the supermarket, officials say
Frank Gardner
BBC security correspondent
I am told the French authorities have "high confidence" that the two Kouachi brothers are the only two suspects directly involved in yesterday's attack on Charlie Hebdo, but that there may be accomplices.
The UK has increased security at some borders, including at ports and rail entry points, in the wake of Paris attack.
Hugh Schofield
BBC News, Paris
The two suspects, Cherif and Said Kouachi, were spotted in a light grey Renault Clio north east of Paris. One witness at a petrol station told police they were masked and armed, and the the car's registration plates were masked. Police believe they may be heading back to Paris, and armed officers are being posted at access points into the capital. The fear is that the brothers may be determined to die in another bloody attack.
Image source, AFPJournalists at the AFP news agency held up "Je Suis Charlie" signs as they held their minute's silence.
Image source, AFPThe deputy commissioner of the Metropolitan Police Craig Macket (pictured fourth from the left) leads police officers in a silence outside Scotland Yard in London.
BBC Monitoring
Editorial in France's Liberation, external: "Against pencils, charcoal pencils and [speech] bubbles - they took out Kalashnikovs. What a declaration of weakness! When one does not have arguments, he fires a shot. So did they kill Charlie? No. They missed. Charlie will live, thanks to its readers."
BBC Monitoring
Spanish newspapers are among many to carry editorials about the attacks. The country suffered Europe's worst terror attack when 191 people were killed in bombings at a Madrid station. El Mundo writes, external "The terror attack on Charlie Hebdo is an attack on the entire system of our values, which, despite its faults, glorifies the greatest freedom of the individual, the person's dignity, freedoms and respect for human rights."
Image source, AFPTributes of pens and flowers have been left in Place de la Republique, Paris
Three groups that campaign for freedom of expression are calling for media organisations and the public to publish Charlie Hebdo cartoons at the same time. The Comic Book Legal Defense Fund, Index on Censorship and PEN America say in a statement it is "only through solidarity... can we defeat those who would use violence to silence free speech". The protest is planned at 1400 GMT.
A local television station, BFMTV, reports that the main entrance points to Paris have been blocked by police, and the car with suspects in is believed to be to the west of the city.
Image source, Getty ImagesMetropolitan police officers, seen here outside New Scotland Yard, observed the silence.
Police forces across the UK have taken part in a minute's silence. Here's a story about the commemoration in Wales.
Image source, M RoskellM Roskell emailed her cartoon: "Forever and always freedom #jesuischarlie"
Steve Sparrow emails: These so called "Islamists" have nothing whatsoever to do with Religion in any of its forms. Someone who worships a God will know beyond any doubt that no God in any religion would condone outright murder in their name or any other name. The terrorists (for that is what they are) think they will be rewarded in their heaven. How wrong could someone possibly be. These people have no concept of how precious life is and how it should be lived. They are basically cowards who shelter behind a word they describe as religion.
The minute's silence, which started at midday local time (11:00 GMT), went ahead across the whole of France not just Paris, and was punctuated by the sound of church bells, AFP reports.
Mr Pelloux added: "It's very hard. We are all suffering, with grief, with fear, but we will do it anyway because stupidity will not win." He said the publication would have to be put together outside Charlie Hebdo's headquarters, which are not accessible following the massacre.
Charlie Hebdo will come out next week, one of its surviving staffers told AFP. It will publish next Wednesday to defiantly show that "stupidity will not win," said columnist Patrick Pelloux.
The Chinese president, Xi Jinping, has sent a letter of condolence to his French counterpart Francois Holland. In it he says "terrorism is the common enemy of the whole humanity, a threat faced by China and France and the international community", Xinhua reports.
Social media is awash with cartoons showing solidarity with Charlie Hebdo. Here are a selection.
The lights of the Eiffel Tower are set to be switched off at 20:00 local time (19:00 GMT) to commemorate the victims of the Charlie Hebdo attack, as this tweet, external from @Paris confirms.