People attend a vigil in Prague to honor victims of the Bastille Day tragedy in Nice, France, on July 15, 2016. World leaders are expressing dismay, sadness and solidarity with France over the attack carried out by a man who drove a truck into crowds of people celebrating France's national day in Nice.
Vit Simanek/AP Photo
Istanbul's iconic Bosporus Bridge is lit in the colors of the French flag, with the Ottoman-era Mecidiye mosque in Ortakoy square in the foreground, on July 15, 2016, in solidarity with the victims of Thursday's attack in Nice, France.
Lefteris Pitarakis/AP Photo
A life-size copy of the renown Michelangelo Buonarroti's David is displayed supine, as a tribute to the victims of the terrorist truck attack in Nice, France, during a ceremony at Repubblica square in Florence, Italy, on July 15, 2016.
Maurizio Degl'Innocenti/AP Photo
Adam Yates (Britain), Thomas de Gendt (Belgium), Peter Sagan (Slovakia), Chris Froome (Britain) and Stage winner Tom Dumoulin (Netherlands) lay flowers after observing a minute of silence to commemorate the victims of the Nice truck attack on the podium of the thirteenth stage of the Tour de France cycling race on July 15, 2016.
Peter Dejong/AP Photo
King Felipe VI and Queen Letizia of Spain hold a minute of silence for the victims of the terrorist truck attack in Nice, France at Zarzuela Palace on July 15, 2016, in Madrid.
Pablo Cuadra/Getty Images
People stand in front of Rome's city hall "Campidoglio" lit up in blue, white and red, the colors of the French flag, in tribute to the attack victims of Nice on July 15, 2016.
Russian Foreign Minister Sergei Lavrov, left, U.S. Secretary of State John Kerry right, pay tribute to the victims of the terrorist attack in Nice at a memorial in front of the French embassy in Moscow on July 15, 2016.
People hold a minute of silence during an event to commemorate the victims of an attack in Nice near the French embassy in Berlin, July 15, 2016.
Markus Schreiber/AP Photo
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, July 15, 2016.
Damir Sagolj/AP Photo
Flowers in the colors of the French flag are left on the fence of the French embassy in Madrid, July 15, 2016.
Daniel Ochoa de Olza/AP Photo
A Turkish police special forces officer stands outside the French Institute, adjacent to the French consulate in central Istanbul's Istiklal Avenue, the main shopping road of Istanbul, July 15, 2016.
Lefteris Pitarakis/AP Photo
Cambodian citizens light candles forming the word “Solidarity” during a ceremony at the French Institute in Phnom Penh, Cambodia, July 15, 2016.
Indian students from DAV Public School pray during a candlelight vigil for the victims of the recent attack in Nice, France, in Amritsar, India, July 15, 2016.
Ukrainians line up to lay flowers in tribute to the victims of the July 14 Nice attack, in front of the French embassy in Kiev, Ukraine, July 15, 2016.
People look at the French flag projected in lights onto the Tel Aviv city hall building in Israel on July 15, 2016, as a tribute to the victims of the July 14th terror attack in Nice, France.
U.S. Democratic Congressmen Joseph Crowley of New York (L) and John Lewis of Georgia (C), along with House Minority Leader from California Nancy Pelosi (R), hold a moment of silence for the victims of the recent attack in Nice, France, on the West Front of the U.S. Capitol in Washington, July 14, 2016.