World joins France in grief as petals and prayers honour Nice attack victims

The French and European flags fly at half-mast among flags of the other member states of the European Union in front of the European Parliament in Strasbourg, France, in tribute to the victims of Nice Bastille Day truck attack, July 15, 2016. (REUTERS/Christian Hartmann)

The French and European flags fly at half-mast among flags of the other member states of the European Union in front of the European Parliament in Strasbourg, France, in tribute to the victims of Nice Bastille Day truck attack on 15 July 2016. Reuters

European Union flags set of half staff outside the European Commission headquarters in Brussels, Belgium, Friday, July 15, 2016, to pay tribute to victims of an attack at the France city Nice. A large truck mowed through revelers gathered for Bastille Day fireworks in Nice, France, killing more than 80 people and sending people fleeing into the sea as it bore down for more than a mile (2 Km) along the Riviera city's famed waterfront promenade. (AP Photo/Darko Vojinovic)

European Union flags set of half staff outside the European Commission headquarters in Brussels, Belgium, Friday on 15 July 2016, to pay tribute to victims of a terror attack at the French city Nice. A large truck mowed through revelers gathered for Bastille Day fireworks in Nice, France, killing more than 80 people. AP

A soldier stands next to a half staff French flag, at the Elysee palace in Paris, Friday, July 15, 2016. French Prime Minister Manuel Valls said the government is declaring three days of national mourning after the attack in Nice that left at least 84 people dead. Speaking after an emergency meeting, Valls said the national mourning would begin Saturday. (AP Photo/Thibault Camus)

A soldier stands next to a half staff French flag, at the Elysee palace in Paris, Friday, 15 July 2016. French Prime Minister Manuel Valls said the government is declaring three days of national mourning after the attack in Nice that left at least 84 people dead. AP

A Union flag flies at half-mast in memory of the Bastille Day truck attack in Nice, at the Houses of Parliament in London, Britain July 15, 2016. (REUTERS/Paul Hackett)

A Union flag flies at half-mast in memory of the Bastille Day truck attack in Nice, at the Houses of Parliament in London, Britain on 15 July 2016. Reuters

People gather by flowers laid near the scene where a truck mowed through revelers in Nice, southern France, Friday, July 15, 2016. A large truck mowed through revelers gathered for Bastille Day fireworks in Nice, killing more than 80 people and sending people fleeing into the sea as it bore down for more than a mile along the Riviera city's famed waterfront promenade. (AP Photo/Francois Mori)

People gather by flowers laid near the scene where a truck mowed through revelers in Nice, southern France, Friday, on 15 July, 2016. AP

A woman puts flowers near the scene where a truck mowed through revelers in Nice, southern France, Friday, July 15, 2016. A large truck mowed through revelers gathered for Bastille Day fireworks in Nice, killing more than 80 people and sending people fleeing into the sea as it bore down for more than a mile along the Riviera city's famed waterfront promenade. (AP Photo/Francois Mori)

A woman puts flowers near the scene where a truck mowed through revelers in Nice, southern France, Friday, on 15 July, 2016. AP

Turkish police special forces officers patrol outside the French consulate in central Istanbul's Istiklal Avenue, the main shopping road of Istanbul, Friday, July 15, 2016. Security forces continue to patrol the area around the French consulate in Istanbul Friday a day after an attack in the French resort town of Nice. (AP Photo/Lefteris Pitarakis)

Turkish police special forces officers patrol outside the French consulate in central Istanbul's Istiklal Avenue, the main shopping road of Istanbul, Friday, July 15, 2016. Security forces continue to patrol the area around the French consulate in Istanbul on Friday, a day after an attack in the French resort town of Nice. AP

Taiwan's landmark building Taipei 101 is lit up in blue, white and red, the colours of the French flag, following the Bastille Day killings in Nice, in Taipei, Taiwan July 15, 2016. (REUTERS/Tyrone Siu)

Taiwan's landmark building Taipei 101 is lit up in blue, white and red, the colours of the French flag, following the Bastille Day killings in Nice, in Taipei, Taiwan on 15 July 2016. Reuters

People place candles in a circle during a vigil in a tribute to the victims of the Bastille Day tragedy, in Sydney, Australia, Friday, July 15, 2016. World leaders are expressing dismay, sadness and solidarity with France over the attack carried out by a man who drove truck into crowds of people celebrating France's national day in Nice. (AP Photo/Rob Griffith)

People place candles in a circle during a vigil in a tribute to the victims of the Bastille Day tragedy, in Sydney, Australia, on Friday, 15 July , 2016. World leaders are expressing dismay, sadness and solidarity with France over the attack carried out by a man who drove truck into crowds of people celebrating France's national day in Nice. AP

People stand around a circle of candles during a moment of silence at a vigil to honor victims of the Bastille Day tragedy in Nice, France, in Sydney, Australia, Friday, July 15, 2016. World leaders are expressing dismay, sadness and solidarity with France over the attack carried out by a man who drove truck into crowds of people celebrating France's national day in Nice. (AP Photo/Rob Griffith)

People stand around a circle of candles during a moment of silence at a vigil to honour victims of the Bastille Day tragedy in Nice, France, in Sydney on 15 July, 2016. AP

Indian school children attend a prayer ceremony in memory of victims of a truck attack in France, at a school in Ahmadabad, India, Friday, July 15, 2016. A large truck mowed through revelers gathered for Bastille Day fireworks in Nice, killing dozens of people and sending people fleeing into the sea as it bore down for more than a mile along the Riviera city's famed waterfront promenade. (AP Photo/Ajit Solanki)

School children attend a prayer ceremony in memory of victims of a truck attack in France, at a school in Ahmadabad on Friday, 15 July, 2016. President Pranab Mukherjee wrote to French President Francois Hollande, conveying condolences on the loss of lives in a heinous act of terror in Nice. AP

Leaders stand for a minute of silence for the victims of a deadly attack in the French city of Nice, before the opening session of the Asia-Europe Meeting (ASEM) summit in Ulaanbaatar, Mongolia, Friday, July 15, 2016. (Damir Sagolj/Pool Photo via AP)

Leaders stand for a minute of silence for the victims of a deadly attack in the French city of Nice, before the opening session of the Asia-Europe Meeting (ASEM) summit in Ulaanbaatar, Mongolia, Friday, on 15 July, 2016. AP

People stand next to covered bodies in the early hours of Friday, July 15, 2016, on the Promenade des Anglais in Nice, southern France. France has been stunned again as a large white truck killed many people after it mowed through a crowd of revelers gathered for a Bastille Day fireworks display late Thursday evening, in the Riviera city of Nice. (AP Photo)

People stand next to covered bodies in the early hours of Friday, on 15 July, 2016, on the Promenade des Anglais in Nice, southern France. AP