Flags will fly at half-mast on Whitehall government buildings and the UK will observe a minute's silence at 11 o'clock this morning.
The silence will be held across Europe in remembrance of those who lost their lives in the series of terrorist attacks in Paris.
The terrorist incidents, which took place on Friday night claimed at least 129 lives and hundreds of casualties.
Members of the public who have been directly affected by the incidents in Paris, or who are concerned about family members and friends who may be directly affected can call the Foreign and Commonwealth Office on 020 7008 0000.
People have rushed to social media to show their support for Paris following a series of fatal terror attacks on the capital.
The latest advice for anyone planning to travel to France with news from travel operators on what services are running
A 41-year-old Frenchman has been charged with possession of an air rifle and a knife after an incident at Gatwick Airport.