The US has issued a worldwide travel alert to its citizens, citing terrorist threats from Isis, al-Qaeda, Boko Haram and "other terrorist groups".
The alert from the US State Department urges US citizens to exercise caution in public places and during holidays and public events.
French President Francois Hollande will meet Barack Obama at the White House on Tuesday to discuss the fight against so-called Islamic State.
French warplanes have destroyed 35 targets belonging to the so-called Islamic State in Syria during a wave of strikes in response to the Paris terror attacks last week, the country’s military have announced.
Colonel Gilles Jaron, a spokesman for the French military, said that around 60 bombs had been dropped at six sites, targeting the terror group’s command centres and training sites.
He said the aim of the latest airstrikes was to weaken Isis and erode its ability to organisation.
France was already part of the US-led coalition against Isis in Syria and Iraq, but has sharply increased actions in response to the terror attacks last Friday which claimed at least 129 lives and wounded hundreds of others.
The Charles de Gaulle nuclear-powered aircraft carrier ship left on Wednesday for the eastern Mediterranean, tripling France's airborne forces in the fight against the Islamist terror group.
France and the US have agreed to step up airstrikes in Syria and Iraq to target IS in the wake of the Paris attacks.
Britain will do "all in our power" to support France in the fight against IS following the Paris terror attacks, David Cameron said.
The United Nations Security Council agreeS to intensify efforts to 'eradicate' Islamic State in the wake of the Paris terror attacks.