Travel groups keep services to Paris open

François Hollande, the French president, announced immediately after Friday’s attacks that he was imposing controls on the country’s borders but many international airlines and other travel services vowed to continue services.

Air France said in the early hours of Saturday local time that it intended to maintain operations but that extra security might cause delays. It warned passengers to ensure they brought valid identification documents.

“Air France is standing with the authorities in order to ensure the high standards of safety and security of its customers and staff,” it said in a statement on its website.

Eurostar, the cross-Channel rail service, also said it intended to operate normally on Saturday, although, like Air France, it offered passengers who wanted to change their travel plans the chance to do so.

“Eurostar trains are planned to run on Saturday,” the operator wrote on Twitter, “For those who no longer wish to travel on 14/11 please call us for a free exchange.”

It also cautioned travellers to check in an hour before departure and to check for updates in case services were delayed.

Passport restrictions will be imposed — unusually — on travellers moving between countries within Europe’s Schengen border-free zone.

One of the few international transport operators to announce disruption to its services to and from Paris was American Airlines, which said it was suspending operations until the situation became clearer.

However, United and Delta, its US-based rivals, said they were continuing operations while monitoring the situation.

Separately, U2 late on Friday night in New York cancelled a concert scheduled for Saturday night in Paris as part of the band’s world tour.

In New York the police department said extra officers would be deployed to key locations, although it stressed there was no significant threat.

“No known threat to the city at this time, but until we learn more, we are deploying more police out of an abundance of caution,” the NYPD tweeted.

New York governor Andrew Cuomo said the One World Trade Center spire would be lit blue, white and red to honour the victims of the attack.